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Help with a Trigonometry Problem?

0 votes

Could someone explain to me how they got this answer? Help would be much appreciated! Thanks.

asked Jul 10, 2013 in TRIGONOMETRY by anonymous Apprentice

1 Answer

0 votes

cosθ=3x

Using pythogorus trigonometric rule,

tan^2θ=sec^2θ-1

Here secθ=1/cosθ

tan^2θ=(1/cos^2θ)-1

            =(1/(3x)^2)-1

            =(1/9x^2)-1

Therefore option B is correct

 

answered Jul 10, 2013 by bradely Mentor

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