2012
Mathematics
JAMB
If angle θ is 135°, evaluate cosθ
A.
1/2
B.
√2/2
C.
−√2/2
D.
−1/2
Correct Answer: −√2/2
Explanation
θ = 135° Cos 135o = Cos(90 + 45)o = cos90ocos45° - sin90osin45° = 0cos45° - (1 x √2/2) = −√2/2
θ = 135° Cos 135o = Cos(90 + 45)o = cos90ocos45° - sin90osin45° = 0cos45° - (1 x √2/2) = −√2/2THIS WEEK's
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