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hardequalsmath
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Find all real numbers: 3sin^2xsinx=0 HELP! I just basically need help knowing when i add/sub pi or 2pi
 one year ago
 one year ago
hardequalsmath Group Title
Find all real numbers: 3sin^2xsinx=0 HELP! I just basically need help knowing when i add/sub pi or 2pi
 one year ago
 one year ago

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hashim12atd Group TitleBest ResponseYou've already chosen the best response.0
6sin^2 (x) cos^2 (x) sinx=0 Take sinx common you get sin(x)=0 As you know sin(n pi) =0 so x= n*pi where n is an integer... For remaining portion 6sinx cos^2 (x)1=0 we get sinx cos^2 x=1/6 as cos^2 x= 1sin^2 x sinx sin^3 x=1/6 solve the cubic equation
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
why not just factor out sin(x) \[\sin(x)[3\sin(x) 1] = 0\] so fins the values where sin(x) = 0 and sin(x) = 1/3 they are the solutions.
 one year ago

hardequalsmath Group TitleBest ResponseYou've already chosen the best response.0
i lknow you take the inverse sin for both but then it tells me to sub tract the inverse of 1/3 from pi....and idk why
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
will if you know the sin curve it looks like dw:1373607480309:dw so that covers sin(x) = 0 now for the other angle \[x = \sin^{1}(\frac{1}{3})\] just type it into a calculator.
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
well 1st find your angle then convert it to radians \[1^o = \frac{\pi}{180}... radians\] so you will need to convert your answer. \[answer \times \frac{\pi}{180}..radians\] then when you get you answer, which will be 1st quadrant the other angle will be pi  answer in radians
 one year ago

hardequalsmath Group TitleBest ResponseYou've already chosen the best response.0
how do you know its pi and not 2pi?
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
1st quadrant angle in degrees angle in radians 2nd quadrant angles are 180  angle or pi  angle 3rd quadrant 180 + angle or pi + angle 4th quadratn 360  angle or 2pi  angle
 one year ago

hardequalsmath Group TitleBest ResponseYou've already chosen the best response.0
oh wow thanks so much you dont know how long ive been lost....:) thanks
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
glad to help...
 one year ago

hardequalsmath Group TitleBest ResponseYou've already chosen the best response.0
so just to clarify for first quadrant....its just the answer you get from the inverse of sin?
 one year ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.1
thats correct... then 2nd quadrant is 180  that angle for degrees or pi  angle in radians
 one year ago

hardequalsmath Group TitleBest ResponseYou've already chosen the best response.0
ok thanks
 one year ago
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