um take home test...i have no idea what im doing

always sometimes never
1. sin2x=2sinx
2. cos (pie/3+x)=-sinx
3. if tan x=3 and tan y=2 then tan (x+y)=5
4. when you use the half angle formulas you choose whether to use a + or - by noting in which quadrant the angle lies
5. using a graphing calc to solve a system of trigonometric equations yields the exact results

and the list goes on so if anyone can help with this stuff let me know

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