- #1

- 43

- 0

*cos*. I just plugged this into my calculator to solve for me and got it right.

^{2}(θ) = 0.6Now I'm curious though. How would one solve this by hand?

- Thread starter HunterDX77M
- Start date

- #1

- 43

- 0

Now I'm curious though. How would one solve this by hand?

- #2

berkeman

Mentor

- 58,169

- 8,217

Take the square root of 0.6 by hand, and use cosine tables?cos. I just plugged this into my calculator to solve for me and got it right.^{2}(θ) = 0.6

Now I'm curious though. How would one solve this by hand?

- #3

- 34,575

- 5,978

If you really mean 'by hand' (no calculator),cos. I just plugged this into my calculator to solve for me and got it right.^{2}(θ) = 0.6

Now I'm curious though. How would one solve this by hand?

cos(2θ) = 2 cos

π/2 - 2θ ≈ 0.2

θ ≈ π/4 - 0.1

Check (by calculator): cos

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