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OpenStudy (anonymous):
Write the expression as the sine, cosine, or tangent of an angle. cos 107° cos 42° + sin 107° sin 42°
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OpenStudy (raden):
cosAcosB + sinAsinB = cos(A-B)
OpenStudy (anonymous):
@RadEn so cos(65)?
OpenStudy (raden):
yep
OpenStudy (raden):
but dont forget it can represented be sine use the identity : cos(90-x)° = sinx°
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