I have these two problems I'm working on!
First of the Double Angle Formula! This formula I attempted to do a lot but couldn't get to the identity!
sin2θ⋅cos2θ=18[1−cos(4θ)]
For Above question you can only use the following:
sin2θ=12(1−cos(2θ))cos2θ=12(1+cos(2θ))
And lastly this Sum And Difference Formula! I tried this one so much, I'm leaning toward it being impossible (it's obviously not.... because it's a question):
cos(a−b)⋅cos(a+b)=(cos2a−sin2b).
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