∫ cos(x) dx
= -sin(x) + C
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∫ cosh(x) dx = sinh(x) + C C is the constant of integration.
Inverse of Cosine is 'ArcCos' or Cos^(-1) The reciprocal of Cosine is !/ Cosine = Secant.
∫ cos(x)/sin2(x) dx = -cosec(x) + C C is the constant of integration.
Yes, the sine, cosine and tangent are integral to problem solving (angles and side lengths) in right angle triangles (triangles with a 90 degree angle included).
Cosine of 1 degree is about 0.999848. Cosine of 1 radian is about 0.540302.