The reference triangle method for evaluating trigonometric functions

This tutorial covers the reference triangle method for evaluating trigonometric functions at special angles. We will not use a calculator but we have to know the 45-45-90 • trigonometry: the rati... and the 30-60-90 special right triangles • trigonometry: the rati...
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[@akashkiransahu5185]

the other method is to remember the four quadrants-
all angles, sines/cosec, tan/cot and sec/cos positives, then we can use 180/360 - required angle and then change the sign with respect to quadrants and functions it falls under

[@murdanthebeet]

For the “try it yourself” problems: (4.) sec(210deg)= -2(square root of 3)/3, (5.) tan(135deg)= -1, (6.) csc(-120deg)= -2

[@Sg190th]

Csc is an odd function right?
-Csc 120 = Csc -120?
-2/sqrt(3)? I guess