Trigonometry, trigonometric functions, sin, cos, tan, cot

Trigonometry, trigonometric functions, sin,cos,tan,cot ... The easiest way to remember the basic values of sin and cos at the angles of 0 , 30 , 60 , 90 : sin([0, 30, 45, 60, 90]) = cos([90, 60, 45, 30, 0]) = sqrt([0, 1, 2, 3, 4]/4)

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