Q. The differentiable functions x and y are related by the following equation:sin(x)+cos(y)=2Also, dtdx=5.Find dtdy when y=4π and 0<x<2π.
Question Prompt: Question Prompt: Find dtdy when y=4π and 0 < x < \frac{\pi}{2} given that sin(x)+cos(y)=2 and dtdx=5.
Differentiate Equation: Differentiate both sides of the equation sin(x)+cos(y)=2 with respect to t. dtd(sin(x))+dtd(cos(y))=dtd(2) Since 2 is a constant, its derivative with respect to t is 0.
Apply Chain Rule: Apply the chain rule to differentiate sin(x) and cos(y) with respect to t.dtd(sin(x))=cos(x)⋅(dtdx) and dtd(cos(y))=−sin(y)⋅(dtdy)So, we have cos(x)⋅(dtdx)−sin(y)⋅(dtdy)=0
Substitute Given Values: Substitute the given values into the differentiated equation.Given dtdx=5 and y=4π, substitute these values to find dtdy.cos(x)⋅5−sin(4π)⋅dtdy=0Since sin(4π)=22, the equation becomes cos(x)⋅5−(22)⋅dtdy=0
Solve for (dtdy):</b>Solvefor$(dtdy).Rearrange the equation to solve for (dtdy): (dtdy)=2/2cos(x)⋅5Since 0 < x < \frac{\pi}{2}, cos(x) is positive. Given sin(x)+cos(y)=2 and y=4π, cos(y)=22, so sin(x)=2−22=22. Thus, cos(x)=22.
Substitute cos(x): Substitute cos(x)=22 into the equation for dtdy. dtdy=(22×5)/(22) Simplifying gives dtdy=5.
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