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Rajib dhungana

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2tan3x cos2x + 1 = tan3x + 2cos2x Or ,2tan3x cos2x + 1 - tan3x - cos2x= 0 Or, tan3x ( cos2x - 1) - ( cos2x- 1) = 0 Or , (tan3x-1) (cos2x-1) =0 Either, tan3x-1=0. Or, cos2x= 1 Or, tan3x = 1. Or, 2x= (4n+1)π/4 Or, 3x = nπ •°• x= (4n+1)π/12 •°• x
at time t hr after second train travels from starting point train 1 , X = 45 * (t+1) train 2 , Y = 60 * t distance apart s^2 = [ 60^2 t^2 + 45^2 ( t+1)^2] 2s ds/dt = 2 * 3600* t + 2025 * 2 (t+1) 2s ds/dt = 7200 t + 4050 t + 4050 2s ds/dt = 11250 t + 4050 s

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