Question

how would I simplfy this (cos x)+(sin x+2)-(sinx-4)(cos x) which should equal 6cosx?

Answer 1

oops it actually (cos x)(sin x+2)-(sinx-4)(cos x) which should equal 6cosx

Answer 2

if the expression were
x*(y+2) - (y-4)*x
could you simplify it?

Answer 3

yes! However my problem is I don't know the tricks yet on simplifying trig function

Answer 4

No trick with this one. treat cos(x) as one thing (just like x in my problem). same with sin(x)
I'll do the first term:
cos(x)*( sin(x)+2) = cos(x)*sin(x) + 2*cos(x)
Just like x(y+2)= xy +2x

Answer 5

Sin (x)-4*Cos(x)= Cos(x)*Sin(X)-4*Cos(x)

Answer 6

2 things: you should keep the parentheses
(sin(x) - 4)*cos(x)
because this is very different from sin(x)-4*cos(x)
Also, the 2nd term has a minus sign out front. Don't forget it.

Answer 7

oh, so the cosxsinx cancel out and we are left with 2cosx-(-4cosx)

Answer 8

yes. and - - 4cos(x) becomes +4cos(x)

Answer 9

which 6cosx

Answer 10

yes

Answer 11

Thanks!