If $y=\sum\limits_{k=1}^6 k\cos^{-1}\left\{{3\over5}\cos kx-{4\over5}\sin kx\right\}$ then $dy\over dx$ at x = 0 is

Numerical Value Type

If you are commenting for the first time, please read the guidelines.

If you are answering for the first time, please read the guidelines.

1.1k questions

772 answers

366 comments

77 users