Question

please answer this ques

Answer 1

is the question this 1- tan²(45-A) = 2 sin A
lets consider 45-A as B
then,
    1 - tan² B = 2 sin a
    1 - tan²B = L H S
    1 - tan²B= sec²B    (sec²B- tan²B= 1)
     sec²B =  L H S
 2 sin A = R H S