cos θ . cos(90 - θ) - sin θ sin (90 - θ) equals:

Question

cos θ . cos(90 - θ) - sin θ sin (90 - θ) equals: (A) 1 (B) 2 (C) -1 (D) 0

Tardigrade Admin · Accepted Answer

Consider cos θ . cos(90 - θ) - sin θ sin(90 - θ) = cos θ . sin θ - sin θ . cos θ = 0

Q. $cos θ . cos (90 - θ) - sin θ sin (90 - θ)$ equals: