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Trigonometry sec of 15, cos 15, sin 15, exact values?

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Trigonometry sec of 15, cos 15, sin 15, exact values?

 

asked Apr 7, 2016 in TRIGONOMETRY by anonymous
edited Apr 7, 2016

1 Answer

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Step :1

The trigonometric values are .

Find

Let .

The trigonometric difference formula is .

Substitute and in the trigonometric formula.

By using trigonometric table values.

.

Step :2

Find

Let .

The trigonometric difference formula is .

Substitute and in the trigonometric formula.

By using trigonometric table values.

.

Step :3

Find

.

The exact values of trigonometric identities are , and .

Solution :

The exact values of trigonometric identities are , and .

answered Apr 9, 2016 by lilly Expert
edited Apr 9, 2016 by lilly

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