Draw a right angled triangle.

Let theta be an angle, 1 will be the opposite side, and 3 will be the hypotenuse.

Can you find the adjacent side through Pythagoras' Theorem?

Then, cos of theta is adj/hyp.

You should get the answer

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- Apr 11th 2011, 11:46 AM #1

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## sin(x)=1/3. What is cos(x?)

Given that , how does one find the exact value of without using a calculator?

The answer is supposed to be , but I don't see how one reaches it. I know the standard sine/cosine angles ( ...) and their corresponding Cartesian coordinates on the unit circle; is the result supposed to be derived from these? If so, how?

- Apr 11th 2011, 12:09 PM #2

- Apr 11th 2011, 12:19 PM #3

- Apr 11th 2011, 12:19 PM #4

- Apr 11th 2011, 12:21 PM #5

- Apr 11th 2011, 12:21 PM #6

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- Apr 11th 2011, 12:46 PM #7

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