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These formulas explain how to add and subtract trigonometric functions (and their arguments). If you've got sum time, see what a difference these formulas will make for your trig toolkit.

\[ \large \dfrac{\cot^375^{\circ}+\tan^375^{\circ}}{\cot75^{\circ}+\tan75^{\circ}} = \ ? \]

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by
**
Khang Nguyen Thanh**

\[\large \dfrac{\sin^2 (3A)}{\sin^2 (A)}-\dfrac{\cos^2 (3A)}{\cos^2 (A)}=2 \]

\[ \implies \large \cos (2A)= \ ? \]

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by
**
Ikkyu San**

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by
**
Omkar Kulkarni**

\[ \large \tan(63^\circ) = \sqrt{\sqrt a-\sqrt b} + \sqrt{\sqrt c-\sqrt b} \]

The equation above is true for positive integers \(a,b,c\). What is the value of \(a+b+c\)?

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by
**
Pi Han Goh**

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by
**
Mehul Chaturvedi**

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