tan(360-a)=-tana

tan(360-a)=-tana

∵tan
＝tan
=tan
=-tana
Tan (360-a) = Tan (- a) because of the odd function of Tan, so: Tan (360-a) = - Tana
6.8 + x = 17.6
It's valid tonight
6.8+x=17.6
x=17.6-6.8
x=10.8
This is the problem of image shifting. After moving 6.8, the sign changes, + sign changes to - sign, - sign changes to + sign, × sign changes to △ sign, △ sign changes to ×
Other people don't embezzle, I'm the first to say it!
Given Tana = 2, then Tan (90 degrees - a) =?
Tan (90 degrees - a) = COTA = 1 / Tana = 1 / 2
Solution equation: 6 (x-3.5) = 17.8-2x
solve equations:
6(x-3.5)=17.8-2x
6x-21=17.8-2x
8x=38.8
x=4.85
6x-21=17.8-2x
8x=38.8
x=4.6
6x-21=17.8-2x
8x=17.8+21
8x=38.8
X = 4.85: how much is 1 / 7 times 3 and 3 / 13 plus 10 times 1 / 7 plus 10 / 7 times 1 / 13?
If 270 degrees
Wrong
270 degrees
Think like this: in the fourth quadrant: SiNx is less than zero, cosx is greater than zero, TaNx = SiNx / cosx, so TaNx
17.4 divided by x = 5.8 to solve the equation
Proving Tan (360 ° - a) = - Tana
∵tan
＝tan
=tan
=-tana
Solve the equation; X + 5 / x = 120
X + 5 / 5 x = 120
(1 + 1 / 5) x = 120
6X = 120
X = 120 × 5 / 6
x=100
X + 5: x = 120, remove the denominator, multiply both sides by 5 at the same time
5x + x = 600 merge congeners
6X = 600, the coefficient is reduced to 1
x=100
X + 5 / 5 x = 120
x+0.2x=120
1.2x=120
x=100
This should be a question in the fraction part,
Multiply both sides of the equation by X + 5 to get x = 120 (x + 5)
Solution: x = 120x + 600
X-120X=600
-119X=600
The solution is: x = - 600 / 119
sin^2(-a)-tan(360-a)tan(-a)-sin(180-a)
Kneeling for the simplest result
Simplification
sin^2(-a)-tan(360-a)tan(-a)-sin(180-a)
=sin^2(a)-tan(-a)tan(-a)-sin(a)
=sin^2(a)-tan^2(a)-sin(a)
=It's not easy. Do you want to see if the title is missing?
The original formula = Sin & # 178; a-tan (- a) Tan (- a) - sin (a)
=sin²a-tan²a-sina
=
The solution equation: (1) 17 -- 120% x = 5 (2) X -- 12% x = 2.816 (3) 4 / 5 × 1 / 4 -- 1 / 2 x=
(4) X + 7x of 9 = 4 of 3 (5) 3x of 4 + 5% x = 17.6
(1) 17 -- 120% x = 5 1.2x = 17-51.2x = 12x = 10 (2) X -- 12% x = 2.816 0.88x = 2.816x = 2.816 △ 0.88x = 3.2 (3) 4 out of 5 × 1 out of 4 -- 1 out of 2 = 11 / 5-1 / 2x of 20 = 1 / 201 / 2x = 1 / 5-1 / 201 / 2x = 3 / 20x = 3 / 10 (4) x + 7x out of 9 = 4 out of 3
Children, if not, can ask the teacher, ask students, ask family, but this solution can not play any role in ha.