Question

if A =60degree,B=30 degree then verify that cos(A+B)=cosA×cosB-sinA× sinB​

Answer 1

Answer:

cos(60+30)=cos90=0

Step-by-step explanation:

Answer 2

Answer:

hope it helps...

Step-by-step explanation:

cos(60+30)=cos60*cos30-sin60*sin30

cos90=1/2*$\sqrt{3}$/2-$\sqrt{3}$/2*1/2

0=$\sqrt{3}$/4-$\sqrt{3}$/4

0=0