contestada

Prove the identity.
cos (x + y)
1- tanx tany
cosx cosy
Note that each Statement must be based on a Rule chos
the right of the Rule.
Statement

Prove the identity cos x y 1 tanx tany cosx cosy Note that each Statement must be based on a Rule chos the right of the Rule Statement class=

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amirarmanveisi

Answer:

Hi... I should do like this

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