Hello, Beard!

Stuck on this and don’t have a clue where I am going wrong.

It's hard to see your work from here.

But it looks like you played the instead of the .Multiply the left side byIt is given that: .

A) Find the value of

. .

Let be an angle such that: .

Then we have: .

. . . . . . . . . . . . . . .

Therefore: .

Show that: .

Since , then: .

Hence, find the maximum value of

and find apositivevalue of at which the maximum value occurs.

The maximum of: . occurs when

. . Then the maximum value is

If , then: .

Therefore: .