Saturday

July 26, 2014

July 26, 2014

Posted by **-** on Sunday, November 8, 2009 at 2:46pm.

can be written as

tan(x+y) = (tanx + tany) / (1 - tanxtany)

- advanced functions -
**bobpursley**, Sunday, November 8, 2009 at 3:03pmrewrite the left side as

sin(x+y)/cos(x+y), then use the addition formulas for both. It will simplify (finally) to the right.

**Related Questions**

adv functions - Show that tanx= (sinx/ cosx) can be written as: tan(x-y) = (tanx...

Trigonometry Check - Simplify #3: [cosx-sin(90-x)sinx]/[cosx-cos(180-x)tanx] = [...

Trigonometry - Given that a^2+b^2=2 and that (a/b)= tan(45degee+x), find a and b...

Trigo - Given that a^2+b^2=2 and that (a/b)= tan(45degee+x), find a and b in ...

Pre-Calc - Trigonometric Identities Prove: (tanx + secx -1)/(tanx - secx + 1)= ...

maths - trigonometry - I've asked about this same question before, and someone ...

Mathematics - Trigonometric Identities - Prove: sinx + tanx = tanx (1 + cosx) ...

Mathematics - Trigonometric Identities - Prove: (tanx)(sinx) / (tanx) + (sinx...

Math - Im really struggling with these proving identities problems can somebody ...

Trig (inverse functions) - Problem: tan[arccsc(-5/3) + arctan(1/4)] My work: let...