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baihe's Question
Math
Posted 5 months ago
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5) Find an equation of a line that is tangent to y=2sinxy=2 \sin x and whose slope is a palue.
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Answer from Sia
Posted 5 months ago
Solution by Steps
step 1
To find the slope of the tangent line to the curve y=2sinxy=2\sin x, we need to differentiate yy with respect to xx
step 2
The derivative of y=2sinxy=2\sin x with respect to xx is y=2cosxy'=2\cos x
step 3
Since we are looking for a tangent line with a specific slope, let's denote this slope as mm
step 4
Set the derivative equal to the slope mm: 2cosx=m2\cos x = m
step 5
To find the xx-coordinate(s) where the slope of the tangent is mm, solve the equation 2cosx=m2\cos x = m
step 6
Once the xx-coordinate(s) are found, use the original equation y=2sinxy=2\sin x to find the corresponding yy-coordinate(s)
step 7
With the point (x,y)(x, y) and the slope mm, use the point-slope form of the equation of a line: yy1=m(xx1)y - y_1 = m(x - x_1)
step 8
Substitute the known values into the point-slope form to get the equation of the tangent line
Answer
The equation of the line that is tangent to y=2sinxy=2\sin x with slope mm is yy1=m(xx1)y - y_1 = m(x - x_1), where (x1,y1)(x_1, y_1) is the point of tangency on the curve and mm is the given slope.
Key Concept
Finding the equation of a tangent line to a curve at a point with a given slope
Explanation
To find the equation of a tangent line with a given slope to a curve defined by a function, we first find the derivative of the function to determine the slope of the tangent at any point. Then we solve for the specific point(s) where the derivative equals the given slope, and use the point-slope form of a line to write the equation of the tangent line.

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