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Find the pricipal solution and general s...

Find the pricipal solution and general solutions of the following
(i) `sin theta=-1/sqrt2` (ii) `cot theta=sqrt3` (iii) `tan theta=-1/sqrt3`

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The correct Answer is:
(i) `npi+(-1)^n)-pi/4, n in Z` (ii) `npi +pi//6, n in Z` (iii) `npi -pi//6, n in Z`
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