Question

Prove that:

(Question attached)​

Answer 1

Hi there !!

Identity used:-

(a+b)²=a²+b²+2ab

sin²0+cos²0= 1

sin²0=1-cos²0

1/sec²0=cos²0

Look at the attachment ↑↑

Thanks !!

Answer 2

Answer:

Identity used:

(a+b)=a?+b?+2ab

sin20+cos?0= 1

sin?o=1-cos?O

1/sec?o=cos²0