Question: Prove the identity. sin x 2 =cos( x ) Use the Subtraction Formula for Sine, and then simplify. sin x 2 = sin( x )

Prove the identity.

sin

x

2

=cos(x)

Use the Subtraction Formula for Sine, and then simplify.

sin

x

2
 =

sin(x)

cos

2

cos(x)
=

sin(x)

0

cos(x)
=

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