Pre-Calculus 4.3: Right Triangle Trigonometry part 2

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Objectives:
1) Use the fundamental trig identities
2) Use a calculator to evaluate trig functions
3) Use trig functions to model and solve real-life problems

  1. Justin Backeberg
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I have one quick question. How are you supposed to find a trigonometric function when 90 degrees has been added or subtracted?


For example, how are you supposed to find the *csc 90°+θ* or *csc 90°-θ* when the cos θ = 1/3? The answer does say that it's 3, but I have absolutely no clue on how to get there. How do I find trigonometric functions when 90°, or 2π radians have been added or subtracted to what I need to find?


I managed to get here because my math teacher would keep on posting your videos as materials. Thanks.

cypmvi