What is cosx times secx?

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Answer 1 · 2016-01-31T03:36:14

$1$

Your question is:

$cosx xx secx$

The trick to this problem is knowing the trigonometric identity:

$secx=1/cosx$

Thus, your problem can be written as

$cosx xx 1/cosx=cosx/cosx=1$

The other inverse trigonometric functions are:

$cscx=1/sinx$

$cotx=1/tanx$