Hello all! I'm studying for a math cumulative on tuesday, and I've come across these problems that I cant solve.

How do I solve this between 0 inclusive and 2 pi?

Cos^2x + 2sinxcosx - sin^2 x = 0

sin(x +1) = cos x

And finally

Logan has a garden in the shape of a sector of a circle; outer rim of garden is 25 ft long and central along of sector is 50, she wants to add a 3 ft wide walk to the outer rim, how many sq ft of paving does she need to build it?

On another note: If I have more trig questions, do I make a new post or continue to post them here?

Edit: I realized I posted this under the wrong section, sorry! Please move this to the trig section