In `Delta ABC` the value of the expression `sum_(r=0)^n (nCr) a^r b^(n-r) cos(rB -(n-r)A)` is...
218 views · Published 11 October 2018 · 5:37 · Indexed 2 October 2026
Channel: Doubtnut · 2018 · Education
To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW In `Delta ABC` the value of the expression `sum_(r=0)^n (nCr) a^r b^(n-r) cos(rB -(n-r)A)` is equal to
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