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**sin(t) cos(2t) = ??**

ok so i have to find the values for b1,b2 and b3...but i am clueless on how to find them

can anyone help?

sin(t) cos(2t) = b1 sin(t) + b2 sin(2t) + b3 sin(3t):

i thought of converting it to complex but that did not help much!