Categories > trigonometry > Solution of trigonometric equations > If $0\le x\le \pi $and ${{81}^{{{\sin }^{2}}x}}+{{81}^{{{\cos }^{2}}x}}=30$, then x =

trigonometry

Question: If $0\le x\le \pi $and ${{81}^{{{\sin }^{2}}x}}+{{81}^{{{\cos }^{2}}x}}=30$, then x =


1) $\pi /6$
2) $\pi /2$
3) $\pi /4$
4) $3\pi /4$
Solution: Explanation: No Explanation
Solution of trigonometric equations

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