Find . Any help would be appreciated cheers x
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Originally Posted by Haris Find . Any help would be appreciated cheers x Substitute $\displaystyle u = 4 + \cos (y)$.
Originally Posted by Haris Find . Any help would be appreciated cheers x Let $\displaystyle z=4+\cos y\implies \,dz=-\sin y\,dy$ Thus, the integral transforms into $\displaystyle -7\int\frac{\,dz}{z}$ Can you take it from here?
I got -7ln(4+cos(y))+C but its wrong i think?
Originally Posted by Haris I got -7ln(4+cos(y))+C but its wrong i think? Don't be so helpless. Try to differentiate it and see whether you get the integrand ....
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