If y=∑ k=1 to 6 k cos⁻¹{...}... | Differentiation | JEE Main 2020

JEE MAIN 2020

02-09-2020 S2

Question

If $y=\sum_{k=1}^6 k \cos ^{-1}\left\{\frac{3}{5} \cos k x-\frac{4}{5} \sin k x\right\}$, then $\frac{d y}{d x}$ at $x=0$ is

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JEE Main

Mathematics

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