Question

срочнооооо помогите пжжж​

Answer 1

Ответ:

1.

$\cos^{2} ( \alpha ) + \cos^{2} (90 - \alpha ) = \cos^{2} ( \alpha ) + \sin ^{2} ( \alpha ) = 1$

2.

$\sin^{2} ( \alpha ) - \cos^{2} (90 - \alpha ) = \sin^{2} ( \alpha ) - \sin ^{2} ( \alpha ) = 0$

Answer 2

$1) \cos( \alpha {)}^{2} + \cos(9 {0}^{0} - \alpha {)}^{2} = \cos( \alpha {)}^{2} + \sin( \alpha {)}^{2} = 1 \\ \sin( \alpha {)}^{2} - \cos(9 {0}^{0} - \alpha {)}^{2} = \sin( \alpha {)}^{2} - \sin( \alpha {)}^{2} = 0$