Question

(sin 90° + COS 60° +COS 45°) * (sin 30*+COS O° - COS 45°)​

Answer 1

Answer:

(1+1/2+1/root 2) (1/2+1-1/root 2 )

(3/2 +1/ root 2) (3/2 -1/root 2)

by (a+b) (a-b) = a^2 - b^2

(3/2)^2 - (1/ root 2)^2

9/4 -1/2

9-2 / 4

7 /4 answer