# If #Sin17^@ =x/y# , then show that #Sec17^@ - sin73^@ = x^2/(ysqrt((y^2 - x^2))# ?

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If #Sin17^@ =x/y# , then show that #Sec17^@ - sin73^@ = x^2/(ysqrt((y^2 - x^2))#

If

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See full explanation for solution.

#### Explanation:

By the cofunction identity:

So we have

By the Pythagorean ID,

Rearranging

(Since

Now we substitute

Now we do some algebra:

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