Question

solve and find the principal solution of sin^2 7x= 0​

Answer 1

Step-by-step explanation:

sin7x+cos2x=−2

This is only possible if sin7x=−1, and cos2x=−1

⇒cos7x=0, and cos2x=−1

⇒7x=(2n+1)

2

π

, and 2x=2mπ±π,m,n∈I

Taking intersection of these two we get x=2kπ+

2

π

,k∈