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The concept of trigonometric function in high school mathematics
Analysis:

//See the attached figure for details.

//Drawing area (-2π, 2π)

Characteristics [Observation Area (0, π/2)]

(1)sinx and tanx are tangent at the origin.

(2)sinx (or tanx) is tangent to the straight line y=x and the origin.

(3)sinx and tanx have only one intersection.

(4)tanx & gt; X> Sinks

PS:

When sinx and tanx draw together, they must draw an auxiliary straight line y = X.