# If cos40o = p, then write the value of sin 40o in terms of p.

We know that

cos2 θ + sin2 θ = 1

cos2 40° + sin2 40° = 1

sin2 40° = 1 – cos2 40°

sin 40° = (1 cos2 40°)

And Given that cos 40° = p

sin 40° = √(1– p2)

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