Q: What is cosine of 3?

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The argument of the cosine function must be (2pi/3)*x radians

It doesn't exist. The maximum value of the cosine is 1.00, so no angle can have a cosine of (pi), because (pi) is more than 3.

Cosine(30) = sqrt(3)/2

-sqrt(3) / 2

what is the cosine of 3.14 ?

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The argument of the cosine function must be (2pi/3)*x radians

cos(30) = sqrt(3)/2 so cosine squared is 3/4.

It doesn't exist. The maximum value of the cosine is 1.00, so no angle can have a cosine of (pi), because (pi) is more than 3.

Cosine(30) = sqrt(3)/2

-sqrt(3) / 2

It is cosine*cosine*cosine.

The integral of cosine cubed is sinx- 1/3 sin cubed x + c

0.866 ( or (sqrt 3)/2 )

what is the cosine of 3.14 ?

Cosine of 1 degree is about 0.999848. Cosine of 1 radian is about 0.540302.

Tangent = sine/cosine provided that cosine is non-zero. When cosine is 0, then tangent is undefined.

0.75