secant of (A) = cosecant of (90- A)
'A' here is 80 degrees.
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The minimum value of the secant and cosecant is ' 1 '. There are no zeros.
No.
The inverse sine is the cosecant, otherwise known as "hypotenuse over opposite" or arcsine. The cosecant is often confused as being the inverse of the cosine, which, in reality, is the secant, otherwise known as "hypotenuse over adjacent" or arccosine.
cosecant = 1/sine csc 90 deg = 1/(sin 90 deg) = 1/1 = 1
The inverse of sine (sin) is cosecant (csc). The inverse of cosine (cos) is secant (sec). The inverse of tangent (tan) is cotangent (cot).