三角法
周期性を使って sin(theta - 360°) を簡単にする
360° を角度から引いても正弦が変わらない理由を見て、sin(theta - 360°) を同値な関数 sin(theta) に簡単にします。
Problem
Which of the following functions is equal to ?
Step 1: Use the Periodicity of Sine
The sine function has a period of , meaning
for any integer .
Step 2: Substitute
Since
we have
Step 3: Final Answer
Therefore, the function equal to is
概念
Unit Circle and Radian Measure
Extending trigonometric ratios beyond acute angles to any angle measure using the unit circle. The coordinates of the point on the circle are . Radian measure connects angle size to arc length. Includes negative angles, angles greater than , and exact values for special angles in all four quadrants.
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