D differentiate Dec 2008 161 12 Australia Mar 10, 2010 #1 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

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

Miss Mar 2010 165 40 Planet earth. Mar 10, 2010 #2 differentiate said: 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 Click to expand... Find the derivative and set it equal to \(\displaystyle x \, cos(x)\). Then, solve the last equation for a,b,c and d. Reactions: differentiate

differentiate said: 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 Click to expand... Find the derivative and set it equal to \(\displaystyle x \, cos(x)\). Then, solve the last equation for a,b,c and d.