Cos 2X

     
Alan p Feb 13, 2015displaystylecosleft(2x ight)+2cosleft(x ight)+1=0when displaystylex=fracpi2(plusdisplaystylenpifor all ...

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Of course you can use the trigonometric addition formulas: cos(2x)=cos^2(x)-sin^2(x)=2cos^2(x)-1 sin(2x) = 2sin(x)cos(x) cos(3x)=cos(x)cos(2x)-sin(x)sin(2x)=cos(x)(4cos^2(x)-3) ...
How vì chưng you find all solutions of the following equation in the interval <0,2pi> of displaystyle3cos2x+cosx+2=0 ?
https://socratic.org/questions/how-do-you-find-all-solutions-of-the-following-equation-in-the-interval-0-2pi-of-4
displaystyle70^circ53;289^circ47,60^circ;300^circ Explanation:3cos 2x + cos x + 2 = 0Replace cos 2x bydisplaystyleleft(2cos^2x-1 ight)--> displaystyle3left(2cos^2x-1 ight)+cosx+2=0 ...

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3, left parenthesis, 2, cosine, squared, x, minus, 1, right parenthesis, plus, cosine, x, plus, 2, equals, 0 ..." role="text" class="MathExpression_mathExpression__22QI1 ">
https://www.quora.com/How-do-I-solve-a-equation-like-2-cos-x+-cos-x+30-0-using-scientific-calculator
First let’s start by finding a solution to lớn the given problem by using the Texas Instruments 92 Plus scientific calculator , or equivalently the TI-Nspire CAS . The radian unit of angular measure will ...
displaystyle0,360,104^circ48,255^circ52 Explanation:Use trig identity:displaystylecos2x=2cos^2x-1. Replace in the equation cos 2x bydisplaystyleleft(2cos^2x-1 ight) ...

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After you substitutedisplaystyle2cos^2left(x ight)-1fordisplaystylecosleft(2x ight) , it becomes quadratic equation wheredisplaystyleu=cosleft(x ight) ...
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left< eginarray l l 2 & 3 \ 5 và 4 endarray ight> left< eginarray l l l 2 và 0 và 3 \ -1 và 1 & 5 endarray ight>
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