verify the identity: cos5t-cos3t= -8sin(squared)t[(2cos(cubed)t-cost)]
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Hello, cos(5t)=cos(4t+t)=cos(4t)cos(t)-sin(4t)sin(t) cos(4t)=cos(2*2t)=2cos²(2t)-1 sin(4t)=sin(2*2t)=2cos(2t)sin(2t) Continue and finish it... There had to be a relation that can simplify, but i can't get on it anymore...
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