MATH116 Lecture 3: lect116_4_f15
9 Dec 2015
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Monday, september 21 lecture 4 : trig functions review (refers to section 1. 7 in your text (d. trim) ) Students who have mastered the content of this lecture know about: The measurement of an angle is said to be x radians when x represents the curve length of the arc of a unit circle starting at the point (1, 0) moving counter clockwise. The units of the curve length is assumed to the same as the units measuring the length of the radius. Since the arc length of half a unit circle is units the angle in radians which is equivalent to 180 degrees is radians. 4. 4 graphs of trig functions. sin2 cos2 = 1. This means the curve repeats itself at constant intervals. The period of sine and cosine is equal to 2 . The period of tan x is as seen in the graphs above.
