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MATHEMATICS

JAMB 2012 - Question 35

Mathematics 2012 JAMB Past Questions - Question 35: If angle θ is 135 ° , evaluate cosθ

If angle θ is 135 ° , evaluate cosθ

A: 1/2

B: √2 /2

C: -√2/2

D: -1/2

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Correct Answer

Explanation

= 135, evaluate coscos 135 = cos (90 +45) = cos 90 cos 45 - sin 90 sin 45 0cus 45 - (1x√2/2) = - √2/2