Question 1

Establish the identity. cos (a - B) =1 + tan atan B cos a cos B . . . Choose the sequence of steps below that verifies the identity. O A. cos (a - B) cos a cos B+ sin asin B cos a cos B sin a sin B =1 + tan a tan B cos a cos B sin a sin B sin a sin B sin a sin B O B. cos (a - B) cos a cos B - sin asin B cos a cos B sin a sin B = 1+ tan atan B cos a cos B cos a cos B cos a cos B cos a cos B O C. cos (a - B) sin a sin B- cos a cos B sin asin B cos a cos B cos a cos B cos a cos B = 1 + tan a tan B cos a cos B cos a cos B O D. cos (a - B) cos a cos B+ sin asin B cos a cos B sin a sin B cos a cos B cos a cos B = 1+ tan tan B cos a cos B cos a cos B