Question

can anyone solve the questions 3&4

Answer 1

hope it's helpful to u...☺☺☺

Answer 2

(3).

Given sin theta + sin^2 theta = 1
 
           sin theta + 1 - cos^2 theta = 1

           sin theta - cos^2 theta = 1 - 1

           sin theta - cos^2 theta = 0

           sin theta = cos^2 theta


On squaring both sides, we get

sin^2 theta = cos^4 theta

1 - cos^2 theta = cos^4 theta

cos^2 theta + cos^4 theta = 1.



(4)

Given A = 45 and B = 30.

We know that sinA cosB - cosAsinB = sin(A - B).

 = sin(45 - 30)

= sin 15 

$= \frac{ \sqrt{3} - 1 }{2 \sqrt{2} }$



Hope this helps!