Q. 1 D4.2( 5 Votes )

# Find the values o

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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