[" 20."," If "sin B=(1)/(2)" हो,तो "3cos B-4cos^(3)B" Value of "],[" Do it "]

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

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

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

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 0ltAltBltpi, sin A-sinB=(1)/(sqrt2) and cos A-cos B=sqrt((3)/(2)) , then the value of A+B is equal to

If 0ltAltBltpi, sin A-sinB=(1)/(sqrt2) and cos A-cos B=sqrt((3)/(2)) , then the value of A+B is equal to

If sqrt2 cos A = cos B + cos^(3) B "and" sqrt2 sin A = sin B - sin^(3) B, "then the value of" sin (A - B) "will be"

If sin A+sin B=p,cos A+cos B=q Find the value of cos2A+cos2B