diff-equation

Question: The solution of the differential equation ${{\cos }^{2}}x\frac{{{d}^{2}}y}{d{{x}^{2}}}=1$ is



1) $y=\log \cos x+cx$
2) $y=\log \sec x+{{c}_{1}}x+{{c}_{2}}$
3) $y=\log \sec x-{{c}_{1}}x+{{c}_{2}}$
4) None of these
Solution: Explanation: No Explanation
Miscellaneous differential equations

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