Question

If A=60° and B = 30° , prove that:
cos(A + B) = cosA cosB - sinA sinB​

Answer 1

Answer:

YOUR ANSWER

Step-by-step explanation:

cos(60+30)=cos60cos30-sin60sin30

cos90=cos60cos30-sin60sin30

0=1/2x√3/2 -√3/2x1/2

√3/4-√3/4=0

0=0

HOPE YOUR QUESTION IS SOLVED!!!!!!