A little help with my pre calc homework please?

samuel c

New member
I have to verify these trig identities but I have absolutely no idea where to start.
1. sin x+cos xcot x= csc x

2. tan x 1+sec x
------- + ---------- = 2csc x
1+sec x tan x

3.(sec^2 x -1)(sin^2 x -1)= -sin^2 x

4. sin^3 x + cos^3 x
------------------------- = 1-sin xcos x
sin x + cos x
 
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