Determining non-permissible values for trig expressions

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Examples
Lessons
  1. Determine all restrictions in radians
    1. cosx1+2sinx\frac{\cos x}{1 + 2 \sin x}
    2. secx1cosx\frac{\sec x}{1 - \cos x}
    3. tanx+cscx\tan x + \csc x
    4. 5sinx2\frac{5}{\sin x -2}