Let `0lt=a,b,c,dlt=pi` where b and c are not complementary such that `2cosa+6cosb+7cosc+9cosd=0...
201 views · Published 12 October 2018 · 5:43 · Indexed 5 October 2026
Channel: Doubtnut · 2018 · Education
To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW Let `0lt=a,b,c,dlt=pi` where b and c are not complementary such that `2cosa+6cosb+7cosc+9cosd=0` and `2sina-6sinb+7sinc-9sind=0` Then the value of `cos(a+d)/cos(b+c)` is
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