Question

sin theta is equal to cos theta. find 2tan square theta +sin square theta -1

answer very urgent​

Answer 1

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

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Answer 2

Answer:

sin² theta

Step-by-step explanation:

sin theta = cos theta × 1

sin theta / cos theta = 0

tan theta = 0

2 tan² theta + sin² theta -1

2(0)² + cos² theta -1

cos² theta - 1

=sin² theta