find 3 coeff. b1, b2, b3 E of R3 such that:
sin(t)cos(2t) = b1sin(t) + b2sin(2t) + b3sin(3t).
i just need a clue of the formula i need to use. thx alot.

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that's what i thought, but it's a linear algebra class so I think it's a little tougher than that.

waaaa never mind i think it's that simple.

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