I am pretty sure I'm almost done the first one.
#1
Use the identity for sin2x and an identity for cos2x to verify that
but when I use the formula for double angles like where with a
I think it is
Thanks for any help you may have.
And
#2
how do you find roots/solve something like
or I algebraically? I have done questions where you have to do proofs, but I have no examples like this from my teacher, thanks.
sorry about the multiple questions but the site was down lol.