Prove that cos(a+b) = cos a cos b - sin a sin b

1.	Prove that cos(a+b) = cos a cos b - sin a sin b
Answer» Answer: How to prove cos (A+B) = cos A cos B - sin A sin B? Consider a right angle triangle ABC such that AC =3 cm, BC = 4 cm and AB = 5 cm, here Step-by-step explanation: please give THANKS and vote me and Mark me as brainlist

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Answer:

How to prove cos (A+B) = cos A cos B - sin A sin B? Consider a right angle triangle ABC such that AC =3 cm, BC = 4 cm and AB = 5 cm, here

Step-by-step explanation:

please give THANKS and vote me and Mark me as brainlist

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Prove that cos(a+b) = cos a cos b - sin a sin b

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