Trig Identities & Exact Value (p3 of 4): theta is in quad IV and sin(theta)=-3/5. Find sec & cot.

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Fundamental Trigonometric Identities & Exact Value (:
#1: Let (-2, -7) be a point on the terminal side of (theta). Find the exact values of cos(theta), sec(theta),and cot(theta).

#2: let theta be an angle in quadrant IV such that sin(theta)=-3/5. Find the exact values of sec(theta) and cot(theta).

#3: Let (theta) be an angle in quardrant II,such that cot(theta)=-sqrt(55)/3. Find sin(theta) and sec(theta) by using fundamental trigonometric identities.

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[TucsonMathDoc]

@LaPrinnay

Assuming you're referring to the '4' at 1:23 - using Pythagoreans theorem, you have sqrt(5^2 - 3^2) = 4 because the reference angle R is in the right triangle. Hope this helps. Cheers. - MathDoc

[LaPrinnay]

Thanks for this, but I don't understand where the four came from.