Question

(sin A - 1)(2 cos A - 1)=0

Answer 1

(sin A - 1)(2 cos A - 1)=0

2 sin A cos A - 2 cos A - sin A + 1 = 0

sin 2 A - 2 cos A - sin A = -1

Answer 2

Answer:

A = 90° or A = 60°

Step-by-step explanation:

either,

(sin A - 1)=0

sin A = 1

also sin 90=1

therefore, A=90°

or,

(2 cos A-1)=0

2 cos A=1

cos A=½

also cos 60 = ½

therefore A=60°