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May 27, 2016
Posted by **Rajesh kumar** on Saturday, December 17, 2011 at 9:06pm.

- trig math -
**Reiny**, Saturday, December 17, 2011 at 10:39pmThe identity is not true,

All I need is one counterexample.

let x=10°

LS = tan10° tan 70° = .48445

RS = tan 30 = .577

LS ≠ RS

we don't have an identity