Question

Pls... answer this fast guys , u will be rewarded 90 points
simplify :
1)cos Θ ( secΘ - cosΘ)
2)sin²Θ + 1/1+tan²θ
3)1/(1+cos B) + 1/(1-cos B)
4(1+tan²A)/(1+cot²A)

Answer 1

Answer:

$1) \: \cos\alpha ( \frac{1}{ \cos\alpha } - \cos \alpha ) \\ = > \: \cos \alpha( \frac{1 - {cos }^{2} \alpha }{ \cos \alpha }) \\ = > 1 - { \cos }^{2} \alpha = \bold{ {sin}^{2} \alpha }$

Answer 2

Answer:

1) cos(1/cosx-cosx)

1-cosx= sinx

2) directly sin2(-x)

3)