Posted by **Theresa** on Friday, April 30, 2010 at 6:40pm.

I really need help so please help.

write the first trigonometric function in terms of the second trigonometric function.

sec x; tan x

- Trig. -
**John**, Friday, April 30, 2010 at 6:43pm
think of sec x as 1/cos x.

- Trig. -
**John**, Friday, April 30, 2010 at 6:45pm
oops i take that back

- Trig. -
**John**, Friday, April 30, 2010 at 6:46pm
big hint: sec x is the hypotenuse of a triangle with legs tan x and 1.

- Trig. -
**Reiny**, Friday, April 30, 2010 at 8:09pm
from

sin^2 Ø + cos^2 Ø = 1

divide each term by cos^2 Ø

sin^2 Ø/cos^2 Ø + 1 = 1/cos^2 Ø

tan^2 Ø + 1 = sec^2 Ø

sec Ø = √(tan^2 Ø + 1)

- Trig. -
**Shayla**, Saturday, May 1, 2010 at 1:33am
Thank you, Reiny! It helped me a lot.

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