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solve in intervel (0-2pie)
- Thread starter bballbink
- Start date
D
Deleted member 4993
Guest
bballbink said:sin(3x) = 0
\(\displaystyle sin(3x) \, = \, sin (n\pi)\)
\(\displaystyle 3x \, = \, n\pi\)
now continue.....
sin(2x+x)
sin2x cosx+ cos2x sinx
where do i go from here
D
Deleted member 4993
Guest
bballbink said:i am not familiar with that way of solving. the npie thing.
So then tell us what you are familiar with!
First off, it's "pi", not "pie".
If I asked you to solve the equation tan2x = 1 could you proceed as follows?
Let u = 2x.
Then tan u = 1, therefore u=?/4 or 5?/4 or 9?/4 or 13?/4 or...etc.
But u = 2x.
Therefore 2x=?/4 or 5?/4 or 9?/4 or 13?/4 or...etc.
If 2x=?/4, then x=?/8.
If 2x=5?/4, then x= 5?/8.
etc.
If I asked you to solve the equation tan2x = 1 could you proceed as follows?
Let u = 2x.
Then tan u = 1, therefore u=?/4 or 5?/4 or 9?/4 or 13?/4 or...etc.
But u = 2x.
Therefore 2x=?/4 or 5?/4 or 9?/4 or 13?/4 or...etc.
If 2x=?/4, then x=?/8.
If 2x=5?/4, then x= 5?/8.
etc.