Question

Verify the identity:

sinxtanx + cosx = secx

Answer 1

Awe, so that's it, you're asked to verify it? Interesting

Answer 2

You might start by writing tan x in its equivalent form involving sin x and cos x.
Do the same for sec x (except that the sine would not be invoved for sec x).

Answer 3

You will need to know your fundamental identities for this.. tanx= sinx/cosx , cotx= cosx/sinx , do you have those written down?

Answer 4

Then to put more weight in the proof you can consider the Pythagorean Trig Identities... Starting with sin^2(x) + cos^2(x) =1

Answer 5

One way to verify is 1. Factor out sinx on the left side of the equation 2. Divide both sides by sin(x) 3. Last step divide through by tangent of x and you will notice a Pythagorean Trig Rule..