If and , then the value of is…

MATHEMATICS · Subjective · ISC · Mathematics · Physics · Calculus

Problem

If f(x)=∑n=1∞sin⁡nx4nf(x) = \sum_{n=1}^{\infty} \frac{\sin nx}{4^n} and ∫0πf(x)dx=log⁡(mn)\int_0^\pi f(x) dx = \log\left(\frac{m}{n}\right) , then the value of (m+n)(m+n) is ...

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