Trigonometric Functions-II, Trigonometric Functions of 3A in Terms of a

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Trigonometric Functions of 3A in Terms of A

(A) Sin 3A in Terms of Sin A

Substituting for in the formula

,we get

………..

(B) Cos 3A in Terms of Cos A

Substituting for in the formula

, we get

………..

(C) Tan 3A in Terms of Tan A

Putting in the formula , we get

………….

(D) Formula for Sin3a and Cos3A

or

Similarly,

or

Example:

Prove that

Solution:

L.H.S.

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