Question
अवकल समीकरण ${\cos ^2}x\frac{{{d^2}y}}{{d{x^2}}} = 1$ का हल है
समाकलन करने पर, $\frac{{dy}}{{dx}} = \tan x \pm {c_1}$
पुन: समाकलन करने पर, $y = \log \sec x \pm {c_1}x \pm {c_2}$
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