Q. 295.0( 2 Votes )

# If and x lies in IInd quadrant, find the values of and

Answer :

**Given:**

We know,

sin^{2} x + cos^{2} x = 1

⇒ cos^{2} x = 1 – sin^{2} x

Since,

⇒cosx will be negative in second quadrant

So,

We know,

cos 2x = 2 cos^{2} x – 1

Since,

So,

We know,

cos 2x = 1 – 2 sin^{2} x

Since,

So,

We know,

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