Sin100? =? Please, thank you

Sin100? =? Please, thank you

sin100=sin(90+10)=cos10
If triangle + triangle + triangle + square + square equals 24, triangle = square + square, then what is triangle equal to, square
If triangle + triangle + triangle + square + square = 24, triangle = square + square, then what is triangle equal to and what is square equal to
Triangle + triangle + triangle + square + square = 24 as formula (1),
The formula (2) is triangle = square + square
Substitute formula (2) into formula (1), that is, triangle + triangle + triangle = 24
So triangle = 6
Substituting (2), then square = 3
A math problem: how much is sin20 Degree * cos100 degree - cos170 Degree * sin70 degree
It is known that cos 100 degree = cos (90 + 10) degree = sin 10 degree
Cos 170 = cos (180-170) = cos 10
Sin70 = cos20
There are sin20 degrees * cos100 degrees - cos170 degrees * sin70 degrees = sin20 degrees * sin10 degrees - cos10 degrees * cos20 degrees
= - cos (20 + 10) degree
=- cos 30 degrees
= - (3 under root) / 2
The above formula is equal to - sin20 Degree * cos80 degree + cos10 Degree * sin70 degree = cos10 Degree * sin70 degree - sin10 Degree * cos70 degree = sin (70-10) degree = two-thirds root sign three
Known: Triangle plus triangle equals circular triangle divided by triangle equals square triangle minus triangle, etc
Known: Triangle plus triangle equals circle
A triangle divided by a triangle is a square
Triangle minus triangle equals five pointed star
Square plus circle plus five pointed star equals 9.6
Ask: triangle and circle each is how many?
Triangle = a circle = b square = C Pentagram = D
a+a=b
a/a=c
a-a=d
c+b+d=9.6
c=1 d=0 b=8.6 a=4.3
Triangle = 4.3 circle = 8.6
Triangle = a circle = b square = C Pentagram = D
a+a=b
a/a=c
a-a=d
c+b+d=9.6
c=1 d=0 b=8.6 a=4.3
A math problem ~ cos100 * cos140 * cos160 =?
The answer is - 1 / 8, cos100 * cos140 * cos160 = - cos20 * cos40 * cos80 = - sin20 * cos20 * cos40 * cos80 / sin20 = - sin160 / 8sin20 = - 1 / 8
-0.125
Key: sine double angle formula, sine and cosine conversion
Original formula = (- sin10) * (- cos40) * (- cos20)
=(-sin10)*(-cos40)*(-cos20)*(cos10)/(cos10)
Put sin10 and cos10 together
= -(sin10*cos10)*cos20*cos40/cos10
=-(1 / 2 sin20) * Co
-0.125
Key: sine double angle formula, sine and cosine conversion
Original formula = (- sin10) * (- cos40) * (- cos20)
=(-sin10)*(-cos40)*(-cos20)*(cos10)/(cos10)
Put sin10 and cos10 together
= -(sin10*cos10)*cos20*cos40/cos10
=-(1/2 sin20)*cos20*cos40/cos10
=-(1/2sin20*cos20)*cos40/cos10
=-(1/4sin40)*cos40/cos10
=-(1/8sin80)/cos10
=-1/8cos10/cos10
=-1 / 8 = - 0.125 ﹣ put away
=166421265, the calculator can be operated by pressing~
*What do you mean? Please raise the question again
This is not a special angle, but it is troublesome. The final answer is about:
-1.8793852415718167681082185546495
(square minus triangle) times (square minus triangle) equals 81, triangle equals 10, square equals?
Let the square be X,
（x-10）²=81
x-10=±9
x1=19,x2=1
A: a square equals 1 or 19
If the terminal edge of a passes through the point (sin100, cos100), the general expression of the same angle as the terminal edge of angle a is?
There should be cycles, right
K * 360 + 100 or K * 360 + 170 or K * 360 + 80 or K * 360-30
tanA=cos100/sin100=cot100=-tan70
therefore
A=k*360°-70°
Question supplement: find the value of COS (a + Wu / 2) + sin (Wu + a) / Tan (- a), sin a = 0.8, cos a = - 0.6, Tan a = - 4 / 3, the original formula = - 0.8-0.8 * 3 / 4 = - 1.4,
If the square minus triangle equals 5, calculate: 62 times the square minus 62 times the triangle
How many is a triangle and how many is a square
62 times square minus 62 times triangle
=62 times (square minus triangle)
=62 times 5
=310
We can't figure out the specific values of triangles and squares
How many is a triangle and how many is a square
But 62 ×□ - 62 ×△ can be calculated
Known □ - △ = 5
Then 62 × □ - 62 ×△ = 62 × (□ - △) = 62 × 5 = 310
A-B = 5,62 * a-62 * b = 62 * (a-b) = 62 * 5 = 310, a: square, B: triangle. This problem does not need to know the specific values of squares and triangles
■-▲=5
62x■-62x▲
=62x(■-▲)
=62x5
=310
As for how many squares and triangles are equal to, it is impossible to calculate them, because there are no exact values, such as 6 and 1, 7 and 2, 8 and 3
sin100°cos 110° cos100°sin110°
=sin100°cos110°＋cos100°sin110°
=sin(100°＋110°)
=sin210°
=sin(180°＋30°)
=－sin30°
=－1/2
If a triangle minus a square equals a circle, then a triangle plus a square plus a circle equals ()
Two triangles
Because a square plus a circle equals a triangle
2 * triangle
△-□=○
△+□+○=△+□+(△-□)=2△
Two triangles
Delta - □ = 0, that is, delta = □ +. So delta + □ +. Zero = delta +. Delta = 2 *
Two triangles
Delta - □ = 0, that is, delta = □ +. So delta + □ +. Zero = delta +. Delta = 2 *