Home
Class 11
MATHS
If ABCD be a cyclic quadrilateral,-prove...

If ABCD be a cyclic quadrilateral,-prove that cos A + cos B + cos C + cos D = 0

Promotional Banner

Similar Questions

Explore conceptually related problems

If ABCD be a cyclic quadrilateral,-prove that sin A+ sin B -sin C -sin D = 0

Prove that cos 20^@ cos 40^@ cos 60^@ cos 80^@=1/16 .

Prove that cos 4A=1-8cos^2A+8 cos^4A

Prove that cos (A -120^@) + cos A + cos (A + 120^@) = 0 .

If A +B = 90 , prove that cos A = sqrt (cos A/sin B - sin A cos B) .

If A + B + C = pi , prove that cos A + cos B + cos C= 1 + 4 sin(A/2) sin(B/2) sin(C/2)

In any quadrilateral ABCD,prove that sin(A+B)+sin(C+D)=0

if A + B +C= pi/2 ,prove that cos(A - B - C)+ cos (B-C- A) + cos (C- A - B)= 4 cos A cos B cos C

If A + B + C= pi , prove that sin 2A + sin 2B -sin 2C =4cos A cos B sin C

Prove that (sin A+sin 2A)/(1+cos A +cos 2A)=tan A