Question

пomoгитe пoжalyйsтa ///////////////////

Answer 1

Ответ:

$2 \cos(0) + 3 \sin(90) + 4 \tan(180) = 2 \times 1 + 3 \times 1 + 4 \times 0 = 5$

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

$\frac{ { \cos( \alpha ) }^{2} }{1 - { \cos( \alpha ) }^{2} } \times { \tan( \alpha ) }^{2} = \frac{ { \cos( \alpha ) }^{2} }{ { \sin( \alpha ) }^{2} } \times { \tan( \alpha ) }^{2} = { \cot( \alpha ) }^{2} { \tan( \alpha ) }^{2} = 1$