Asked by Hannah

Please help using identities

(2tan30)/(1-tan^2 30)
Answered by Damon
[sin/cos] / [ 1 - sin^2/cos^2 ]

sin cos / [cos^2-sin^2]

sqrt3/4 / [ 3/4 - 1/4 ]

(1/2) sqrt 3
Answered by Steve
Remember your double-angle formulas. You have

tan(2*30) = √3

Reiny dropped the 2 in the numerator...
Answered by Steve
oops, sorry Reiny...
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