Question

sin plus cos multiply sin plus cos

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Answer 1

Answer:

(sin theta+cos theta)(sin theta+cos theta)

=(sin theta+cos theta)²

= sin²theta+cos²theta+2sin theta cos theta

=1+2sin theta cos theta

Answer 2

Step-by-step explanation:

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

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