Find the values of the following trigonometric ratios:
Given 
⇒ 
⇒ cos (-1125°) = cos (1125°)
= cos (90° × 12 + 45°)
1125° lies in first quadrant in which cosine function is positive.
∴ cos (1125°) = cos (90°× 12 + 45°)
= cos (45°)
= 1/√2
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