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# ​ Marty is proving that the following trigonometric identity is true:

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Marty is proving that the following trigonometric identity is true:

SamJones  Feb 21, 2018

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Since   $$1-\cos^2\theta=\sin^2\theta$$

The first line of his proof would be

$$\tan^2\theta\cdot\cos^2\theta=\sin^2\theta$$

hectictar  Feb 21, 2018
#1
+7266
+2

Since   $$1-\cos^2\theta=\sin^2\theta$$

The first line of his proof would be

$$\tan^2\theta\cdot\cos^2\theta=\sin^2\theta$$

hectictar  Feb 21, 2018