Recent content by soccertev

nvm :$

why is sinA on the denominator positive, from what i understand sin((2A-4A)/2)= sin-A

ok, one last question, so to bug the hell outta u, can you explain how the sin function akes it back to positive

i'm pretty sure this gives me -tan3A, does it not?

so how do i solve this then :S

also, i think u made a mistake, in the cos- cos identity, isn't it = -2sin((a+b)/2)...

chaos2009, how did they derive the product and sum formulas from the addition formulas?

actually i didn't use the product sum i used what i was told to use up a few posts

Latex is very confusing for me, so sorry... ok well I'm at sin2AcosA + cos2AsinA / cos2AcosA - sin2AsinA i manipulated tan3A using the sum product identity

ok so now I'm stuck on 2sinAcosA+cos^2A-Sin^2ASinA / cos^2A-Sin^2AcosA+2sinAcosAsinA

I honestly, don't understand what your doing here?

Homework Statement I need help proving this identitiy. ...cos2A-cos4A tan3A = -------------- or tan3A = cos2A-cos4A/sin4A-sin2A ....sin4A-sin2A there both the same, just different way of writing it. please help! :) Homework Equations The Attempt at a Solution I honestly...