Formula to calculate Sin 3 A tan 3 A and cos 3 A

\[cos 3A = 4cos ^{3}A- 3cosA \]

\[sin 3A = 3sinA - 4sin ^{3}A \]

\[tan 3A=\frac{3tanA-tan^{3}A}{1-3tan^{2}A} \]

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