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If \(\dfracdydx+\dfrac3\cos^2 x\,y=\dfrac1\cos^2 x,\ x\in\left(-\dfracπ3,\dfracπ3\right)\) and \(y\!\left(\dfracπ4\right)=\dfrac43\), then \(y\!\left(-\dfracπ4\right)\) equals: | Watch the step-by-step video solution for this NIMCET PYQ.