Question

Solve 2cos²x - 5cosx + 2 = 0 for 180⁰​

Answer 1

Answer:

Correct option is A)

2cos

2

x+3sinx−3=0,0≤x≤180

∘

or 2(1−sin

2

x)+3sinx−3=0

or 2sin

2

x−3sinx+1=0

or (sinx−1)(2sinx−1)=0

or sinx=1,

2

1

⇒x=30

0

,90

0

,150

0