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" Sin "B=(1)/(2)" show that "3cos B-4cos...

" Sin "B=(1)/(2)" show that "3cos B-4cos^(3)B=

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ig sin B=(1)/(2) then prove that 3cos B-4cos^(3)B=0

In a triangle ABC if sin B=(1)/(2)=cos A then 3cos B-4cos^(3)B=(i)sin C(ii)cos C(iii)0(iv)3(sqrt(3))/(2)

If sin B = (1)/(2), then 3 cos B - 4 cos ^(3)B is equal to (a) 1 (b) 3/4 (c) 0 (d) 2 (1)/(2)

If tan A=(1)/(7) and tan B=(1)/(3), show that cos2A=sin4B

If sin B= 1/2 find the value of 3 cosB- 4cos^3B .

If A+B+C=(3pi)/(2) , then show that cos 2A+cos 2B+cos 2C=1-4 sin A sin B sin C .

If A+B+C=(3pi)/(2) , then show that cos 2A+cos 2B+cos 2C=1-4 sin A sin B sin C .

If A+B+C=(3pi)/(2) , then show that cos 2A+cos 2B+cos 2C=1-4 sin A sin B sin C .

If sin B = 0.5, find the value of 3 cos B-4cos^(3)B