Question

If tan A = 1 and tan B = sqrt(3) evaluate cos A. cos B - sin A. sin B
A)(1 + sqrt(3))/(2sqrt(2))
B)(1 - sqrt(3))/(2sqrt(2))
C)(1 + sqrt(3))/(sqrt(2))
D)(1 - sqrt(3))/2​

Answer 1

Answer:

Option B

Step-by-step explanation:

tanA = 1

A = 45 degree

tan B = root 3

B = 60 degree

Now put the values of A and B in equation and by solving that we will get answer as option B.

Thanks.