Maths trigg question
Favorites|Homepage
Subscriptions | sitemap
HOME > > Maths trigg question

Maths trigg question

[From: ] [author: ] [Date: 12-11-19] [Hit: ]
i.So, angle A should lie in the 3rd or 4th quadrant.But the value of SecA is positive, hence A should be in the 4th quadrant.As value of tan is negative in the 4th quadrant,......
Given that secA=3 and angle A is refllex , whats the exact value of tan A

-
Hi There!

Remember the trigonometric identity, 1+tan^2(A)=sec^2(A)

==> tan(A)=√(sec^2(A)-1)

Given, secA=3
==> sec^2(A)=9

==> tan(A)=√(9-1) = ±√8=±√4*2=±2√2

Given that angle A is reflex, i.e greater than 180°
So, angle A should lie in the 3rd or 4th quadrant.
But the value of SecA is positive, hence A should be in the 4th quadrant.

As value of tan is negative in the 4th quadrant, tanA=-2√2

Hope this helps!
Cheers!
1
keywords: trigg,Maths,question,Maths trigg question
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .