The problem asks to find the equation of the tangent line $g$ to the graph of the function $y = \tan x$ at the point $(\frac{\pi}{4}, 1)$. There seems to be a typo in the coordinates of the point, and based on the equation $y = \tan x$, the point should be $(\frac{\pi}{4}, 1)$ since $\tan(\frac{\pi}{4}) = 1$. We will assume the point of tangency is $(\frac{\pi}{4}, 1)$.

AnalysisCalculusDerivativesTangent LinesTrigonometry
2025/3/16

1. Problem Description

The problem asks to find the equation of the tangent line gg to the graph of the function y=tanxy = \tan x at the point (π4,1)(\frac{\pi}{4}, 1). There seems to be a typo in the coordinates of the point, and based on the equation y=tanxy = \tan x, the point should be (π4,1)(\frac{\pi}{4}, 1) since tan(π4)=1\tan(\frac{\pi}{4}) = 1. We will assume the point of tangency is (π4,1)(\frac{\pi}{4}, 1).

2. Solution Steps

To find the equation of the tangent line, we need to find the slope of the tangent line and a point on the line. We are given the point (π4,1)(\frac{\pi}{4}, 1).
The slope of the tangent line is the derivative of the function evaluated at x=π4x = \frac{\pi}{4}.
The derivative of y=tanxy = \tan x is y=sec2xy' = \sec^2 x.
We evaluate yy' at x=π4x = \frac{\pi}{4}:
y(π4)=sec2(π4)y'(\frac{\pi}{4}) = \sec^2(\frac{\pi}{4})
Recall that secx=1cosx\sec x = \frac{1}{\cos x}. Also, cos(π4)=22\cos(\frac{\pi}{4}) = \frac{\sqrt{2}}{2}, so sec(π4)=22=2\sec(\frac{\pi}{4}) = \frac{2}{\sqrt{2}} = \sqrt{2}.
Therefore, sec2(π4)=(2)2=2\sec^2(\frac{\pi}{4}) = (\sqrt{2})^2 = 2.
The slope of the tangent line at x=π4x = \frac{\pi}{4} is m=2m = 2.
Now we can use the point-slope form of a line to find the equation of the tangent line:
yy1=m(xx1)y - y_1 = m(x - x_1)
Here, (x1,y1)=(π4,1)(x_1, y_1) = (\frac{\pi}{4}, 1) and m=2m = 2.
y1=2(xπ4)y - 1 = 2(x - \frac{\pi}{4})
y1=2xπ2y - 1 = 2x - \frac{\pi}{2}
y=2xπ2+1y = 2x - \frac{\pi}{2} + 1

3. Final Answer

The equation of the tangent line is y=2xπ2+1y = 2x - \frac{\pi}{2} + 1.

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