Reciprocal of Cosine is Secant
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it would be secant, 1/cosine
1/cos(x)=sec(x). sec is short for secant.
No. The inverse of the secant is called the arc-secant. The relation between the secant and the cosecant is similar to the relation between the sine and the cosine - they are somehow related, but they are not inverse functions. The secant is the reciprocal of the cosine (sec x = 1 / cos x). The cosecant is the reciprocal of the sine (cos x = 1 / sin x).
Cosine of -90 is 0.
The reciprocal of -3.4 is -0.294