. cos 225 degree
Best Answer
The value of cos225 is -0.707.
Using conversion of degree into radian
θ in radians = θ in degrees × (π/180°)
225 degrees = 225° × (π/180°) rad = 5π/4 or 3.9269
cos 225° = cos (3.9269) = -(1/√2) or -0.707.
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