Help Determining (Dis)Continuity of a Trig Function

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Determining the continuity of trigonometric functions involves understanding their definitions and relationships. The sine and cosine functions are continuous everywhere. Other trigonometric functions, like tangent, are derived from sine and cosine, which means they can be discontinuous at points where their denominators equal zero. For example, tangent is discontinuous at odd multiples of π/2 due to the cosine function being zero at those points. Analyzing the continuity of the six basic trig functions can be done by examining their definitions and identifying points of discontinuity.
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I'm having problems finding whether or not a trig function is discontinuous or continuous. Besides graphing, I don't understand how you can tell. How do you know if a trig function is continuous or not, for the 6 basic functions?
 
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You know that sin(x) and cos(x) are continuous, right? Well, the other trig functions are just made from sines and cosines. For example tan(x) is just sin(x) over cos(x). So tan(x) is going to be discontinuous whenever its denominator is zero. You can similarly analyze the other trig functions.
 
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