Question

Umm pls help me uwu
it my test

Answer 1

I hope it is useful to you .

Answer 2

1.a

$we \: know \: that \: </p><p></p><p>1+cot2A=cosec2A</p><p></p><p>and</p><p></p><p>sin2A=cosec2A1⇒sinA=cosecA1⇒sinA=1+cot2A1</p><p></p><p></p><p>$

2.

$</p><p>sin (A + B) = sin A cos B + cos A sin B</p><p></p><p>Now, \: putting \: B = A \: on \: both \: sides \: of \: the \: above \: formula \: we \: get,</p><p></p><p>sin (A + A) = sin A cos A + sin A cos A</p><p></p><p>⇒ sin 2A = 2 sin A cos A</p><p></p><p>$

b. reffer to attachment