find the exact value of cos(a+B), sin(a-B) and tan (a-B)

label Calculus
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Find the exact value of cos (a+B), sin(a-B), tan(a-B)

a= alpha

B=Beta

May 6th, 2015

cos(a+ B) = cos a cos B − sin a sin B 

sin(a− B) = sin a cos B − cos a sin B 

tan(a− B) = (tan a − tan B) /(1 + tan a tan B )


Regarding any doubt plz let me know 

I think it will be  helpful !


May 6th, 2015

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