Q. 75.0( 2 Votes )

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

We know that

cos2 θ + sin2 θ = 1

cos2 55° + sin2 55° = 1

sin2 55° = 1 – cos2 55°

sin 55° = (1 cos2 55°)

And Given that cos 55° = x2

sin 55° = {1– (x2)2}

sin 55° = √(1 – x4)

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