Question

if tan A =1/√3 find the value of (1) Cos A * cos C-sin A* sin C
(2) sin A*cos C +sin C *cos A​

Answer 1

Answer:

(1) cos(A+C)=cos(30+60)=cos(90)=0

(2) sin(A+C)=sin(30+60)=sin(90)=1