How do you prove $cosx(tanx+secx)=sinx$ ?

Question

2718 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2015-12-24T17:04:08

I don't believe they are equal

This is what I got:

$sinx+1=sinx$

Here's the work:

$cosx(tanx+secx)=sinx$

$cosxtanx + cosxsecx = sinx$

$cosxsinx/cosx + cosx1/cosx = sinx$

$sinx + 1 = sinx$

Could be missing something though...

How do you prove cosx(tanx+secx)=sinxcosx(tanx+secx)=sinx?