trig
posted by Blake .
A coil of wire rotating in a magnetic field induces a coltage E=20sin((PIa/4)  (PI/2)). Use an identity to express this in terms of cos(PIa/4).
Types of Identities:
Double Angle, Half Angle, Sum and Difference of Sine, Cosine, and Tangent, Pythagorean, Reciprocal, Quotient.
Thanks
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