Question

If sec 5A = cosec(A-36) and 5A is an acute angle, show that A = 21

Answer 1

sec5A=cosec(A-36)
cosec (90-5A)=cosec(A-36)
90-5A=A-36
90+36=A+5A
126=6A
A=126/6
A=21

hence proved is A= 21