Trig identities help

[0123456789]

can any one help me solve the trig identiy

sin3x=3sinx-4sinx

 

[ryankachel]

csc4(x)

^i dont know, complete guess

 

[0123456789]

na i have the wrong problem it doesnt even work out but thanks anyways

 

[JockinJLoads]

it looks like the type of problem you have to subsitute and distribute a constant

 

[t_rob]

-90,0,90