Prove that (1) `sinalpha+sinbeta+singamma_sin(alpha+beta+gamma)=4sin((alpha+beta)/2)sin((alph...
1,227 views · Published 11 October 2018 · 4:55 · Indexed 27 September 2026
Channel: Doubtnut · 2018 · Education
To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW Prove that (1) `sinalpha+sinbeta+singamma_sin(alpha+beta+gamma)=4sin((alpha+beta)/2)sin((alpha+gamma)/2)sin((beta+gamma)/2)` (2)`cos(A+B+C)+cos(A-B+C)-cos(A+B-C)+cos(-A+B+C)=4cosAcosBcosC`
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