How to learn Trigonometric Formulae in trigonometry || AB AND CD FORMULAE MEMORISING TECHNIQUE

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In this video I have explained how to learn or memorise Trigonometric Formulae in a very easy and shortcut way.
@DhimanRajeshDhiman

Easy Tricks to Memorise A B and C D Formulae in Trigonometry

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Tricks to Learn A B Formulae For sine angles

When angles are added i. e Sin ( A+B )
When Angles are added and then their Trigonometric Ratios is taken , and if we have to take the Sine of added angles, then it can be done like this.

Start with sine of angle A and multiply it with cosine of angle B and in other part i. e. After +ve sign Start with Cosine of angle A and multiply with Sine of angle B. i.e. start with sine and ends with sine and in middle both the terms are cosine ,and angles start A then B again A then again B.

how-to-memorise-A-B-and-C-D-formulae

When angles are subtracted i. e Sin ( A-B )

When Angles are subtracted and their Trigonometric Ratios is taken , and if we have to take the Sine of subtracted angles, then it can be done like this

Start with sine of angle A and multiply it with cosine of angle B and in other part i. e. After +ve sign Start with Cosine of angle A and multiply with Sine of angle B. i.e start with sine and ends with sine and in middle both the terms are cosine ,and angles start with A then B again A then again B.

how-to-memorise-A-B-and-C-D-formulae

Tricks to Learn A B Formulae For Cosine angles

When angles are added i. e Cos ( A+B )

When Angles are added and then their Trigonometric Ratios is taken , and if we have to take the Cosine of added angles, then it can be done like this.

Start with cosine of angle A and multiply it with cosine of angle B and in other part i. e. After -ve sign Start with Sine of angle A and multiply with Sine of angle B. i.e. 1st and 2nd terms are cosine and 3rd and 4th terms are sine , Angles start with A then B again A then again B.
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