Question

this is the question help me​

Answer 1

Answer:

Step-by-step explanation:

Sin2+cos2=1

Sin2=1-cos2

Answer 2

it is a trigonometric equation ...

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

remodeling this ...

$cos \: transported \: to \: that \: side$

$1 - { \cos }^{2} \alpha = { \sin }^{2} \alpha$

I hope that it will help you