cos
cos(x)
Compute the cosine of x in radians.
Try it yourself:
| $1 | cos(2)
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| $2 | cos(pi / 4) ^ 2
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| $3 | cos(180 deg)
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| $4 | cos(60 deg)
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| $5 | sin(0.2)^2 + cos(0.2)^2
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