Question

Cosec theta - cot theta=3
Find cos theta

Answer 1

Step-by-step explanation:

cosec-cot=3

1-cos=3sin

(1-cos)²=9sin²

1+cos²-2cos=9-9cos²

-8+10cos²-2cos=0

10cos²-2cos-8=0

10cos²-10cos+8cos-8=0

10cos(cos-1)+8(cos-1)=0

(10cos+8)(cos-1)=0

cos=1 or cos=-8/10