Home
Class 11
MATHS
A+B+C=18 0^(@)=>C o s e c A[Sin B cos C+...

`A+B+C=18 0^(@)=>C o s e c A[Sin B cos C+ cos B sin c]=`

A

1

B

0

C

2

D

`-1`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

If A+B+C = 180^@ then (sin 2A + sin 2B + sin 2C) / (cosA + cosB + cosC - 1) =

If A+B+C=(3pi)/2 . Then cos 2A +cos 2B+cos2C is equal to ................. A) 1-4 cos A cos B cos C B) 4 sin A sin B sin C C) 1+2 cos A cos B cos C D) 1-4 sin A sin B sin C

If A+B+C =pi and cos A = cos B cos C then cot B. cot C = ............. A) 1/3 B) 1 C) 2 D) 1/2

If cos(A-B)=3/5 and tanAtanB=2 then......................... A) cos A cos B=1/5 B) sin A sin B = -2/5 C) cos A cos B =-1/5 D) sin A sin B =-1/5

1+ cos 10^(@) + cos 20^(@)+ cos 30^(@)= ............... A) 4 cos 5^(@) cos 10^(@) cos 15^(@) B) 4 cos 10^(@) cos 20^(@) cos 30^(@) C) 4 sin 5^(@) sin 10^(@) sin 15^(@) D) 4 sin 10^(@) sin 20^(@) sin 30^(@)

If tan x= (2b)/(a-c), a!=c, y = a cos^2 x +2b sin x*cos x + c sin^2x, z = a sin^2 x-2b sin x*cos x + c.cos^2x, then

sin 15^(@) + cos 105 ^(@) = ............ A) 0 B) 2 sin 15 ^(@) C) cos 15^(@) + sin 15^(@) D) sin 15^(@) - cos 15^(@)

If ABCD is a cyclic quadrilateral, then cos A + cos B is equal to............. A) 0 B) cos C + cos D C) - (cos C+ cos D) D) cos C- cos D

If A+B+C=pi , prove that cos 2A +cos 2B +cos 2C=-1-4cos A cos Bcos C.

If ABCD is a cyclic quadrilateral, then the value of cosA-cosB+cosC-cosD is............... A) 0 B) 1 C) 2(cos B- cos D) D) 2 (cos A- cos C)