Question

If 2 sin ² + 3 sin 0 = 0 , find the
pesmissible value of cos @​

Answer 1

Answer:

cos(sin

−1

5

2

+cos

−1

x)=0

⇒sin

−1

5

2

+cos

−1

x=cos

−1

0

⇒sin

−1

5

2

+cos

−1

x=

2

π

⇒sin

−1

5

2

=

2

π

−cos

−1

x

⇒

5

2

=sin(

2

π

−cos

−1

x)

⇒

5

2

=cos(cos

−1

x)

⇒x=

5

2