Dr Nick

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About Dr Nick

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Teaching Since: May 2017
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  • MBA (IT), PHD
    Kaplan University
    Apr-2009 - Mar-2014

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  • Professor
    University of Santo Tomas
    Aug-2006 - Present

Category > Geometry Posted 30 Oct 2017 My Price 15.00

What is difference between cos^-1(x ) and 1/cosx?

 

Samina - the first in an inverse trig function while the latter is reciprocal of cos(x)

The argument "x" for cos−1(x)

will always be the ratio of adjacent over hypotenuse. For example:

cos−1(12)=60o

In other words for a right triangle, cos(60o)=12

so the inverse of this is simply cos−1(12)=60o

For the latter using the same example, 1cos(x)

:

1cos(60o)=112=2=sec(60)

Hope that helped

Answers

Dr Nick
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Status NEW Posted 30 Oct 2017 12:10 PM My Price 15.00

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