Asked by Armani
Find sin(2x), cos(2x), and tan(2x) from the given information.
sin(x) = 5/13, x in Quadrant I
sin(2x)?
cos(2x)?
tan(2x)?
I honeslty just need one good example of how to do these please show all work and finalize answer
sin(x) = 5/13, x in Quadrant I
sin(2x)?
cos(2x)?
tan(2x)?
I honeslty just need one good example of how to do these please show all work and finalize answer
Answers
Answered by
Steve
In QI, you have
sinx = 5/13
cosx = 12/13
tanx = 5/12
sin2x = 2sinx cosx = 2(5/13)(12/13) = 120/169
similarly using the other double-angle formulas.
sinx = 5/13
cosx = 12/13
tanx = 5/12
sin2x = 2sinx cosx = 2(5/13)(12/13) = 120/169
similarly using the other double-angle formulas.
Answered by
Armani
How did you know ot multiple it with cos
Answered by
Steve
because I studied the double-angle formulas, as you need to do!
Answered by
Bethany
Ok I know that the equation for
cos(2x)=1-2sin^2(x) How would you plug that in? It will not work
cos(2x)=1-2sin^2(x) How would you plug that in? It will not work
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