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- Oct 10th 2011, 01:11 PM #1

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## tanθ = -2, θ = ?

What is θ such that tanθ = -2, sinθ = 2/sqrt(5), and cosθ = -1/sqrt(5)?

I am doing a question which is not about trigonometry (but involves it in one step) and I do not know how to find theta without using a calculator. I basically want the exact value.

I would greatly appreciate it if someone could show me how to find the exact value of theta.

Thanks in advance!

- Oct 10th 2011, 01:22 PM #2

- Oct 10th 2011, 01:37 PM #3

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- Oct 10th 2011, 01:41 PM #4

- Oct 10th 2011, 01:48 PM #5

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- Oct 10th 2011, 01:54 PM #6

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- Oct 10th 2011, 01:55 PM #7

- Oct 10th 2011, 02:28 PM #8

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- Oct 10th 2011, 03:06 PM #9

- Oct 10th 2011, 03:14 PM #10

- Oct 10th 2011, 06:15 PM #11