If f(x) = (ax + b) sinx + (cx +d ) cosx find constants a, b, c, d, such that f'(x) = xcosx How do I do this? thanks
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Originally Posted by differentiate If f(x) = (ax + b) sinx + (cx +d ) cosx find constants a, b, c, d, such that f'(x) = xcosx How do I do this? thanks Find the derivative and set it equal to $\displaystyle x \, cos(x)$. Then, solve the last equation for a,b,c and d.
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