If x cos A = 1 and tan A = y, then what is the value of x2 – y2.

Given x cos A = 1 and tan A =y and To find: x2 – y2Putting tha values of x and y , we get [∵ cos2 θ + sin2 θ = 1]= 1

Q9 of 268 Page 5

If x cos A = 1 and tan A = y, then what is the value of x² – y².

Given x cos A = 1 and tan A =y

and

To find: x² – y²

Putting tha values of x and y , we get

[∵ cos² θ + sin² θ = 1]

= 1

If cos55° = x², then write the value of sin 55^o in terms of x.

If, sin 50° = α then write the value of cos 50° in terms of α.

Prove the followings identities:

(1 – sin θ)(1 + sin θ) = cso² θ

Prove the followings identities:

(1 + cos θ)(1 – cos θ) = sin²θ