o^_^o ello!
trig trig trig trig
Rewrite as an equivalent expression that does not contain powers of trig functions greater than 1.
\[\huge\rm 8 \cos^2 x\]
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OpenStudy (anonymous):
you mean to tell me you dont know how to do this
OpenStudy (anonymous):
You was teaching me conics
Nnesha (nnesha):
;-;
OpenStudy (anonymous):
2 cos² θ = cos 2θ + 1
OpenStudy (anonymous):
cos 2θ = cos² θ - sin² θ
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OpenStudy (anonymous):
I didn't want to give a sort of direct answer
Nnesha (nnesha):
ohhh
\[\huge\rm cos (2x) = 2 \cos^2 x -1\]
solve for 2cos^2
\[\rm cos (2x) +1 = 2\cos^2\]
hmmm
that's how
2cos^2 = cos (2x) +1
OpenStudy (anonymous):
yup :)
Nnesha (nnesha):
\(\color{blue}{\text{Originally Posted by}}\) @DaWizjr
I didn't want to give a sort of direct answer
\(\color{blue}{\text{End of Quote}}\)
\(\color{blue}{\text{Originally Posted by}}\) @Nnesha
okay so answer is 4+4cos2x
but how ???
\(\color{blue}{\text{End of Quote}}\)
:D i already know the answer :-)
Nnesha (nnesha):
thanks!!! rational & Dawizjr!!!
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