This is a free lesson from our course in Trigonometry
The lesson walks you through the elementary steps that allow evaluating the important
trigonometric functions for the common angle values of the first four quadrants. Here you'll
learn a simple methodology for producing such evaluations with the help of some
examples, practice questions and solution. Let's learn how different quadrants of the coordinate plane and angle relationship are. If x
and y axes divide the cartesian plane into four quadrants. For a point (x,
y), (More text below video...)
When x > 0 and y > 0, the point lies in quadrant I.
When x < 0 and y > 0, the point lies in quadrant II.
When
x < 0 and y < 0, the point lies in quadrant III , and
When
x > 0 and y < 0, the point lies in quadrant IV.
In quadrant I all the trigonometric functions are positive, in quadrant II sine
is positive, in quadrant III tangent is positive and in quadrant IV cosecant is
positive. For example, to find out in which quadrant 185
lies? Place its initial side on the positive side of the xaxis, the position
of the terminal side follow in y axis, then the answer is quadrant III. Once
you go through the instructor's explanation in the video, it'll be easy for you
to understand and do how above trigonometric functions are evaluated.
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