Saturday
May 25, 2013

# Homework Help: trig

Posted by Anonymous on Saturday, May 7, 2011 at 5:49am.

express the trig. ratios sinA,secA n
tanA in terms of cotA.

• trig - drwls, Saturday, May 7, 2011 at 7:39am

tan A = 1/cotA

1/cotA^2 = sin^2A/cos^2A
= (1 - cos^2A)/cos^2A
= [1/cos^2A] - 1

1 + (1/cot^2A) = 1/cos^2A

sec^2A = 1 + (1/cot^2A)

The sign of secA will depend upon the quadrant A is in

Related Questions

Trig - Please help with this one. I've worked it out in so many ways and can...
mathematics trignometry - prove that the following are identity 1. (cotA+cosecA-...
trig - Match each ratio in the first row with an equivalent ratio from the ...
trigonometry - express secA in terms of cotA? can you pleas say how to solve ...
Math - Match each ratio in the first row with an equivalent ratio from the ...
Maths - Hi, can someone give me the answer to this question: secA-tanA=1/4. Find...
algebra - i have a problem in dis sum from complex numbers prove that (1+sinA+...
maths(trigonometry) - prove that sinA-cosA+1/sinA+cosA-1=1/secA-tanA
Math - Prove the identity: tanA/secA+1 = secA-1/tanA Can u please explainit to ...
maths - tanA/secA-1 + tanA/secA+1 = 2 cosecA