Question

How do I found out the solutions using double angle formula for:?

Answer 1

`theta=pi/2,theta=3/2*pi,theta=2*pi-arcsin(2/7),theta=pi+arcsin(2/7)`

Explanation:

Using `sin(2x)=2sin(x)cos(x)` we get the equation
`cos(theta)(7sin(theta)+2)=0`