Q. The differentiable functions x and y are related by the following equation:y1=cos(x)Also, dtdx=−2.Find dtdy when x=π.
Differentiate with respect to t: Differentiate both sides of the equation y1=cos(x) with respect to t using implicit differentiation.Since y1 is y−1, we use the chain rule to differentiate y−1 with respect to t, which gives us −y−2⋅dtdy on the left side. On the right side, the derivative of cos(x) with respect to t is y1=cos(x)0.So, we have y1=cos(x)1.
Substitute given value: Substitute the given value of (dx)/(dt) into the equation.We know that (dx)/(dt)=−2, so we substitute this into the equation to get −y−2∗(dy)/(dt)=−sin(x)∗(−2).
Evaluate sin(x): Evaluate sin(x) when x=π.Since sin(π)=0, we substitute this into the equation to get −y−2⋅dtdy=−0⋅(−2).
Simplify the equation: Simplify the equation.Since −0×(−2) is 0, the equation simplifies to −y−2×dtdy=0.
Solve for (dtdy):</b>Solvefor$(dtdy).To find (dtdy), we divide both sides of the equation by −y−2. However, since the right side of the equation is 0, (dtdy) must also be 0, regardless of the value of y.So, (dtdy)=0.
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