If angle θ is 135°, evaluate cosθ
If angle θ is 135°, evaluate cosθ
12
√22
−√22
−12
Correct answer is C
θ = 135°
Cos 135° = Cos(90 + 45)°
= cos90° cos45° - sin90° sin45°
= 0cos45° - (1 x √22)
= −√22
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