Question

Is it right to say that cos(60+30)=cos60 cos30-sin60 sin30

Answer 1

Answer:

Yes because the expansion of cos (x+y) is

$\cos(x) \cos(y) - \sin(x) \sin(y)$

Answer 2

Answer:

Step-by-step explanation:

Yes, the statement is correct.

we know that,

cos(A+B)=cosA.cosB−sinA.sinB. [ Standard formular]

Here A=60,B=30