# Trig.

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

sec x; tan x

• Trig. -

think of sec x as 1/cos x.

• Trig. -

oops i take that back

• Trig. -

big hint: sec x is the hypotenuse of a triangle with legs tan x and 1.

• Trig. -

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. -

Thank you, Reiny! It helped me a lot.

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