Question

answer please........................​

Answer 1

Step-by-step explanation:

By identity, cosAcosB-sinAsinB = cos(A+B)

$\cos(\pi \div 3) \cos(\pi \div 6) \\ - \sin(\pi \div 3) \sin(\pi \div 6)$

becomes cos($\pi$÷3 + $\pi$÷6)

cos($\pi$/2) = 0