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

a= alpha

B=Beta

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 !

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