Q. 84.7( 3 Votes )

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

Answer :

We know that

cos2 θ + sin2 θ = 1


cos2 50° + sin2 50° = 1


cos 2 50° = 1 – sin2 50°


cos 50° = (1 sin2 50°)


And Given that sin 50° = a


cos 50° = √(1 – a2 )


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