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tyteen4a03
 one year ago
Best ResponseYou've already chosen the best response.0Remember that \(sin^2(x) + cos^2(x) = 1\).

ashwinjohn3
 one year ago
Best ResponseYou've already chosen the best response.1Is 3 sin^2(x2)=cos x

tyteen4a03
 one year ago
Best ResponseYou've already chosen the best response.0@ashwinjohn3 I believe it's 3sin^2(x)  2.

shaqadry
 one year ago
Best ResponseYou've already chosen the best response.0yea its 3 sin^2 (x)  2 = cos (x)

hartnn
 one year ago
Best ResponseYou've already chosen the best response.0change sin^2 x to cos^2 x using \(\sin^2(x) + \cos^2(x) = 1\) then if you put cos^2 x = y, you'll get a quadratic in y.

ashwinjohn3
 one year ago
Best ResponseYou've already chosen the best response.1ok... then,here \[\sin ^{2} x=1\cos ^{2} x\] \[3 (1\cos ^{2}x )2=33 \cos ^{2}x 2=13\cos ^{2}x\]

shaqadry
 one year ago
Best ResponseYou've already chosen the best response.0thats what i get but then i cant figure out how to solve the angle :/

hartnn
 one year ago
Best ResponseYou've already chosen the best response.0put cos x =y, then you get a quadratic in y..

ashwinjohn3
 one year ago
Best ResponseYou've already chosen the best response.1But \[1=\cos ^{2}x+\sin ^{2} x\] =\[\sin ^{2}x+\cos ^{2}x3\cos ^{2}x=\sin ^{2}x2\cos ^{2}x\]

hartnn
 one year ago
Best ResponseYou've already chosen the best response.0\(3 \sin^2 x  2 = \cos x \\ 13\cos^2x = \cos x \\ 13y^2 =y. \\ 3y^2 +y1=0 \) can you solve this quadratic ?

shaqadry
 one year ago
Best ResponseYou've already chosen the best response.0yeaaa but by using calculator, the answer is in decimal point. is there any other way i can calculate the angle?

hartnn
 one year ago
Best ResponseYou've already chosen the best response.0you'll get same answer using any other method, that you got on calculator. whatever you got, equate it to y= ..., ... so, cos x = ... , .... then take cos^{1} (or arccos) of those 2 values ("decimal values"), using calculator, and ou'll get 2 angles.

hartnn
 one year ago
Best ResponseYou've already chosen the best response.0you might be getting, 0.767 and 0.434 then 2 angles will be cos^{1}(0.767) and cos^{1}(0.434) calculate those using calculator.
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