Help with a wordy probelm:

Question

howard-wolowitz · Answer

These are two separate problems!

howard-wolowitz · Answer

These are kinda difficult!

loser66 · Answer

Ha!! the first one is above my head!!! HOw??? in quadrant 1, sin , cos are positive, in quadrant 4, sin is negative and cos is positive 
Hence , no way to find out an angle has the same coordinate with pi/3

loser66 · Answer

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loser66 · Answer

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howard-wolowitz · Answer

hmm well maybe they just wont you to say that its impossible or undefined

loser66 · Answer

why not? I would like to know how mathematicians solve this problem.

howard-wolowitz · Answer

Alright : 
@welshfella 
@paki 
@Jaynator495 
@alexalas

loser66 · Answer

@Hero @paki @e.mccormick @EclipsedStar @tkhunny @UnkleRhaukus @uri

tkhunny · Answer

I can't read it.
Stop tagging people and start showing YOUR work.

howard-wolowitz · Answer

I dont know how to do it, though!

howard-wolowitz · Answer

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michele_laino · Answer

Hint:
I think that we have to refer to this angle:
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