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could you explain to me how you got there?
cosx + isinx
e^(-ix) is cosx - isinx
so their sum is 2cosx
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cosx + (cosx)/i
oh okay. thanks a lot! we never learned that in class =/
u dint know this formula?
no i didn't. i guess i should have googled it first, it was the first page
see shall i teach u things abt complex nos??
I think I've got the rest, at least the ones that I'm being tested on. Could you teach me arcsin relationships with sin and stuff?
For example, tan(arcsin x +arccosx)for x is equal to or between 0 and 1. How would I start?
ur answer is infinity
There's no answer for x where x is equal to or between 0 and 1?
no i dont think so
cos arcsinx + arccosx = pi/2 for all values of x
so its tan (pi/2)