Flag Trigonometry> 1) in a triangle ABC prove that cos(A+B)/...
question mark

1) in a triangle ABC prove that cos(A+B)/2=sin C/2
2) if A, B, C, D be the angles of cycle quadrilateral taken in order prove that
Cos(180-A) +cos(180+B)+cos(180+C)-sin(90+D)
Pls solve these two fast

Nidhi Bhat , 9 Years ago
Grade 11
anser 1 Answers
Rachit Parikh

Last Activity: 9 Years ago

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