If `A+B+C=(3pi)/2` , then `cos2A+cos2B+cos2C` is equal to a.`1-4cos Acos B cos C` b. `4sinAsin B sin C` c.`1+2cos A\cos Bcos C` d. `1-4sinAsin BsinC`

If A +B + C = pi then secA (cos B cos C - sin B sin C) = .........

For any "Delta"A B C the value of determinant |sin^2\ \ A cot A1sin^2B cot B1sin^2\ \ C cot C1| is equal to- s in A s in B s in C b. 1 c. 0 d. s in A+s in B+s in C

If cos(A-B)=3/5a n d\ t a n AtanB=2, t h e n cos A\ cosB=1/5 b. cosA\ cos B=\ -1/5 c. sin A\ sin B=\ -1/5 d. sin A\ sin B=\ -1/5

In a triangle ABC, sin A- cos B = Cos C , then angle B is

int sin x*cos x*cosx2x *cos 4x*cos 8x* cos 16x dx=....+c

If A+B+C=pi,\ t h e n\ |"sin"(A+B+C) sinB cosC -sinB 0 tanA "cos"(A+B) -tanA 0| is equal to a. 2sinB tanA cosC b. 1 c. 0 d. none of these

If A+B=pi/3a n d\ cos A+cos B=1,\ t h e n- a. cos(A-B)=1//3 b. \ |cos A-cos B|\ =sqrt(2/3) c. cos(A-B)=\ -1/3 d. \ |cos A-cos B|=1/(2sqrt(3))

Prove that (sin(B-C))/(cos B cos C)+(sin(C-A))/(cos C cos A)+(sin(A-B))/(cos A cos B)=0

In a right angle triangle ABC, right angle is at B ,If tan A=sqrt(3) , then find the value of (i) sin A cos C+ cos A sin C " "(ii) cos A cos C -sin A sin C

If sin A + sin^2 A + sin^3 A = 1 , then find the value of cos^6 A-4 cos^4 A + 8 cos^2 A .