The Student Room Group

trig identities

hey all

well i managed to miss a week off school and need to learn trig identities (only for C1/C2 though!)

was wondering if someone could post some up, the links in the revision thread are dud!

i know the simple ones like sin30=cos60

but i kinda need to know for them for tomorrows work!!

thank you.
Reply 1
here are some identites from C2 (that I remember...)

(sin^2)x + (cos^2)x = 1

tanx = sinx / cosx

sin30 = cos60 = 0.5

sin60 = cos30 = root 3 / 2

tan45 = 1

tan30 = 1 / root 3

tan60 = root 3
Reply 2
Thank You!

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