My book lacks answers and i suffer much confusion in this. So here goes, but first quick question. How do i produce signs like pi or theta on here like some of the experts do, along with representing fractions as a fraction as opposed to for example 2x/4

I misspelled Identities also in title im aware of this :P

anyway

tan x csc x cos x =1

tan=sin x/cos x

csc x= ? says something like csc(-x)=-csc x

cos x= 1/sec x

so i get

(sin x/cos x)(csc x)(1/sec x)=1 and am stuck here, the csc identity confuses me