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Tan 3A - Trigonometry Formula Derivation

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Published on Oct 9, 2012

There are dozens of formula in trigonometry chapter of math, few of them are very important to be remembered. One of them is tan 2a and tan 3a formula. These trigonometry formula you have to apply in many cases when you are solving the trigonometry expression solving question or proving trigonometry question based on trigonometry ratios of multiple angles and trigonometric ratios of sub multiple angle. You must be familiar with sin 2a, cos2a, tan 2a trig formula, now we have to learn the trigonometry formula for the 3 times of an angle too, So here is the example how we made the formula for tan3a.
This trigonometry video lesson helps you to derive the tan3a formula using few existing trigonometry formula of sum of angles .

To derive , first we have to imagine 3a = a+ 2a
then , take tangent both sides
then, use the formula of sum of two angle for the tangent.. and proceed ..finally you will get he result as it has been solved in above trig video lesson.

I believe this, trigonometry video tutorial has been helpful for you to enhance your concept in trigonometry.

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