Question

8. In each case, given below, find the value of
angle A, where 0° SAS 90°.
(i) sin (90° - 3A) cosec 42° = 1
(ii) cos (90° - A). sec 77° = 1​

Answer 1

Answer:

answer of first part is 16°

Answer 2

1)sin(90°-3A)•cosec 42=1

cos 3A=1÷cosec (90-45)

cos 3A=1÷sec 48

cos 3A=cos 48

3A=48

A=16°

2)cos (90-A) sec77=1

cos (90-A)=cos77

90-A=77

90-77=A

A=13