Q. The differentiable functions x and y are related by the following equation: sin(x)+cos(y)=2. Also, dtdx=5. Find dtdy when y=4π and 0.
Given Equation and Derivative: We are given the equation sin(x)+cos(y)=2 and the derivative dtdx=5. We need to find dtdy when y=4π and x=0. To do this, we will differentiate both sides of the given equation with respect to t using the chain rule.
Differentiating sin(x): Differentiating sin(x) with respect to t gives us cos(x)⋅(dtdx) because the derivative of sin(x) with respect to x is cos(x) and then we multiply by dtdx due to the chain rule.
Differentiating cos(y): Differentiating cos(y) with respect to t gives us −sin(y)⋅(dtdy) because the derivative of cos(y) with respect to y is −sin(y) and then we multiply by dtdy due to the chain rule.
Differentiating constant: Now we differentiate 2 with respect to t, which is a constant, so its derivative is 0.
Derivative Equation: Putting it all together, we get the following equation from the derivatives: cos(x)⋅dtdx−sin(y)⋅dtdy=0
Substitute Values: We substitute the given values into the differentiated equation: x=0, y=4π, and dtdx=5. This gives us:cos(0)⋅5−sin(4π)⋅(dtdy)=0
Solve for dy/dt: We know that cos(0)=1 and sin(4π)=22. Substituting these values into the equation gives us:1×5−(22)×(dtdy)=0
Rearrange Equation: Solving for dy/dt, we get:5−(2/2)⋅(dy/dt)=0
Isolate dtdy: Rearrange the equation to solve for dtdy:(22)⋅(dtdy)=5
Simplify Equation: Divide both sides by 2/2 to isolate dtdy:dtdy=(2/2)5
Rationalize Denominator: Simplify the right side of the equation: dtdy=5×(22)
Final Simplification: Simplify further by multiplying 5 by 22:dtdy=210
Final Simplification: Simplify further by multiplying 5 by 22: dtdy=210To rationalize the denominator, multiply the numerator and the denominator by 2: dtdy=(210)∗(22)
Final Simplification: Simplify further by multiplying 5 by 22: dtdy=210To rationalize the denominator, multiply the numerator and the denominator by 2: dtdy=(210)∗(22)Simplify the expression: dtdy=2102
Final Simplification: Simplify further by multiplying 5 by 22: dtdy=210To rationalize the denominator, multiply the numerator and the denominator by 2: dtdy=(210)∗(22)Simplify the expression: dtdy=2102Finally, we can simplify 2102 to 52: dtdy=52