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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

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

Grade:11

1 Answers

Rachit Parikh
12 Points
7 years ago
A+

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