(2cos20°-sin10°)/sin80° Simplify evaluation

(2cos20°-sin10°)/sin80° Simplify evaluation

(2cos20°-sin10°)/sin80°=(2cos20°-cos80°)/sin80°=[cos20°+(cos20°-cos80°)]/sin80°={cos20°+[cos(50°-30°)-cos(50°+30°)]}/[sin80°]={cos20°+[2sin30°sin50°]}/sin80°={cos20°+sin50°}/sin8...
(2cos20 ° - sin10 °) / sin80 ° = radical 3
Two triangles add up to three squares add up, three squares add up to four circles add up!
One triangle + two squares + one circle = 425
Q: a triangle =? A square =? A circle =?
Two triangles add to three squares
So a triangle is 1.5 squares
The sum of three squares is equal to the sum of four circles
So one circle equals 0.75 squares
One triangle + two squares + one circle = 425
So 1.5 squares + 2 squares + 0.75 squares = 425
4.25 squares = 425
So a square = 100
One triangle = 100 * 1.5 = 150
One circle = 0.75 * 100 = 75
Just set up the equation
Let the triangle be x, the square be y, and the circle be Z
If 2x = 3Y = 4Z, then x = 2Z, y = 4 / 3Z
Substituting x + 2Y + Z = 425
There are 2Z + 8 / 3Z + Z = 425
Z=75
X=150
Y=100
Triangle = 150, square = 100, circle = 75
The value of cos20 ° cos40 ° cos80 ° is______ .
Cos20 ° cos40 ° cos80 ° = 8sin20 ° cos20 ° cos40 ° cos80 ° 8sin20 ° = sin160 ° 8sin20 ° = 18
Two triangles equals three squares, three squares equals four circles, one triangle plus one square plus two circles equals 400,
△=2O
□=4/3O
2 + 4 / 3 + 2 = 5 and 1 / 3 = 16 / 3
O = 400 divided by 16 / 3 = 75
□=75*4/3=100
△=75*2=150
Triangle 150. Square 100. Round 75
Triangle 150 square 100 circle is 75
What's this? Ternary linear equation?
Let two triangles equal three squares, four circles equal 12x
So triangle = 6x, square = 4x, circle = 3x
So 6x + 4x + 2 * 3x = 400
x=25
So the triangle, the square and the circle are 150, 100, 75 respectively
Ask: cos20 × cos40 × cos80 =? Specific process required
cos20°cos40°cos80°
=2sin20°cos20°cos40°cos80°/2sin20°
=sin40°cos40°cos80°/2sin20°
=sin80°cos80°/4sin20°
=sin160°/8sin20°
=sin20°/8sin20°
=1/8
Two triangles are equal to three squares, three squares are equal to four circles, one triangle plus one square and two circles are equal to 400, triangle
Triangle 150
Square 100
Round 75
(1+2/3+1)x=400
x=150
One hundred and fifty
Triangle: 150
Square: 100
Round: 75
How does a circle add a triangle to be equal to 150 calculate
Cos20 ° - cos40 ° - cos80 ° is equal to?
My thinking is very inflexible. I can't understand without explaining the white points
Cos40 + cos80 = cos (60-20) + cos60 + 20) = cos60cos20 + sin60sin20 + cos60cos20-sin60sin20 = 2cos60cos20 = 2 * 1 / 2 * cos20 = cos20, so the original formula is 0
Two triangles add up to three squares, three squares add up to four circles!
1 triangle + 2 squares + 1 circle = 425
How do you do it?
1 triangle + 2 squares + 1 circle = 425 can you give us a unit?
2 circle = 1 triangle, 1 positive = 4 / 3 circle, so the original formula is 2 circle + 8 / 3 circle + 1 circle = 425, 1 circle = 1.1111, 1 positive = 0.75, 1 triangle = 2.222222
How much is cos30
Cos30 & # 186; = 30 & # 186 in a right triangle; the length of the adjacent side of the angle is longer than that of the upper oblique side = two thirds of the root sign 3
The sum of three circles equals the sum of two triangles, the sum of two squares equals the sum of four triangles, the sum of two circles plus one square equals 0.5
Simple linear equations of three variables
Circle = 3 / 14
Square = 1 / 14
Triangle = 9 / 28