Sin30= 1/2, cos30= number of roots 3/2, tan30= number of roots 3/3, sin45= number of roots 2/2, cos45= number of roots 2/2, tan45= 1. I brought a trigonometric function value table for my friend. Come and have a look.

Concept of sine of trigonometric function value

The ratio of the opposite side to the hypotenuse of ∠ a (not a right angle) in a right triangle is called the sine of ∠A, so it is recorded as sinA, that is, the opposite side of ∠A/the hypotenuse of ∠ A, and sine is the ratio of chord to chord. The "string" in the ancient "three strands, four strings and five" is the hypotenuse in the right triangle. The thigh is a human thigh, which is very long. The ancients called the long right side of a right triangle "thigh". Square, right triangle, should be the thigh standing straight.

Introduction to cos cos is the abbreviation of cosine, which stands for cosine function (adjacent sides are more than hypotenuse). In ancient times, sine was an example. The "string" in the ancient "hook three strands, four strings and five" is the hypotenuse of a right triangle. The thigh is a human thigh, which is very long. The ancients called the long right side of a right triangle "thigh". Square, right triangle, should be the thigh standing straight. Sine is the ratio of strands to chords, and cosine is the ratio of remaining right angles to chords.

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