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- Jul 2, 2007
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up to what must we know? (other than the really basic ones)
destroyer had one with sin (2x) = 2*sin(x)cos(x) which none of the other practice material i used had that so I added that and am wondering what else is lacking from my list of math things to memorize.
I searched and found some good threads but some are like 2 years old so just wanted to see what is most applicable to the test now...up to what level of trig identities and such do we need to know?
sin (2x) = 2*sin(x)cos(x) destroyer tells me know this one but others like it like....
cos (2x) = cos^2 (x) - sin^2 (x) = 2*cos^2 (x) - 1 = 1 - s*sin^2 (x)
and the tan 2x etc?
thank you!
destroyer had one with sin (2x) = 2*sin(x)cos(x) which none of the other practice material i used had that so I added that and am wondering what else is lacking from my list of math things to memorize.
I searched and found some good threads but some are like 2 years old so just wanted to see what is most applicable to the test now...up to what level of trig identities and such do we need to know?
sin (2x) = 2*sin(x)cos(x) destroyer tells me know this one but others like it like....
cos (2x) = cos^2 (x) - sin^2 (x) = 2*cos^2 (x) - 1 = 1 - s*sin^2 (x)
and the tan 2x etc?
thank you!
