Find the values of the following trigonometric ratios:
Given 
⇒ 570° = (90° × 6 + 30°)
570° lies in third quadrant in which cosine function is negative.
∴ cos (570°) = cos (90° × 6 + 30°)
= -cos (30°)
1
Find the values of the following trigonometric ratios:
Given
⇒ 570° = (90° × 6 + 30°)
570° lies in third quadrant in which cosine function is negative.
∴ cos (570°) = cos (90° × 6 + 30°)
= -cos (30°)