If A = 60o and B = 30o, find the value of (sin A.cos B + cos A.sin B)2 + (cos A.cos B − sin A.sin B)2.
If (1+cosθ+isinθ1+cosθ−isinθ)4 = cosnθ+isinnθ , then n is
equal to
∫cosn−1xsinn+1xdx, n≠0 is
Let l(n) = 2cosnx, n belong to natural number then l(1) l(n+1) l(n)