Trigonometry: Simmetry, Shifts, Pythagorean Identities

Simmetry, phase shifts and Pythagorean identities for the trig functions sin, cos, tan, cot, sec, csc

Simmetry: The symmetries along x → −x, x → π/2 − x and x → π − x for the trigonometric functions are:

Shifts:The shifts by π/2 and π are:	Pythagorean Identities
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