cos(a+ ß) =cos a cos ß - sin a sin ß Cosine Sum and Difference: cos(a- ß) =cos a cos ß +sinasin ß sin(a + B) =sina cos ß + cosa sin ß Sine Sum and Difference sin(a- ß) =sina cos B - cos a sin ß tana + tan B tan (a + B) = 1- tan a tan B Tangent Sum and Difference tana - tan B tan(a- ß) 1+ tana tan B 23T Find the exact value of sine, cosine and tangent of the angle 12 sin() cos) tan()

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