We will discuss this in greater detail in This illustrates theįact that the trigonometric functions are periodic. The trigonometric functional values of angles coterminal with 0,Īs those above, and the trigonometric functional values repeat themselves (e.g., π and 3π are coterminal and sin (π) = sin (π + 2π) = sin (3π) = 0). Using a similar approach, we can find the six trigonometric functional values for Since any point ( x, y) on the terminal ray of an angle with measureĠ has y coordinate equal to 0, we know that r = | x|, and we have, In finding the six trigonometric functional values of these special angles, and we will begin Definition A quadrantal angle is an angle in standard position whose terminal ray lies alongĮxamples of quadrantal angles include, 0, π/2, π, and 3π/ 2.Ĭoterminal with these angles are, of course, also quadrantal. Now we will find the trigonometric functional values for some special angles.We will begin with the quadrantalĪngles. Position given some point ( x, y) on the terminal ray. Up until now we have found the trigonometric functional value of some angle in standard Biology Project > Biomath > Trigonometric Function > Special Angles Trigonometric Functions
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