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Calculating cos(11pi/8)

How am I supposed to separate 11pi/8 into a mixture of pi/2, pi/3, pi/4 and pi/6?Cant any combination that achieves it.-11pi/8 = (11pi/4) / 2 t = 11pi/8 cos(2t) => cos(t)^2 - sin(t)^2 => cos(t)^2 -

What is the arc length of x=(3y)^(4/3)- ((3y)^(2/3))/(32) from y= -125 to 512

Please Help! I dont understand-Assuming that you actually mean x = 3y^(4/3) - (3/32) t^(2/3): dx/dy = 4y^(1/3) - (1/16) y^(-1/3). So, √(1 + (dx/dy)^2) = √[1 + (16y^(2/3) - 1/2 + (1/256) y^(-2/3))] =

The quadratic equation x^2+(m+4)x+(4m+1)=0, show that m^2-8m+12=0, please explain how to answer this quesion

Would we use the b^2-4ac method? Im confused :/ help is much appreciated :)-This is true only when the quadratic equation is a perfect square. or x has only one root.If we assume the quadratic equati

Help: Exclude leap years from the following calculations: compute the probability

that a randomly selected person does not have a birthday on the 31st day of a month-A non-leap year has 365 days. A person can only have 1 birthday. There are only 7 months that have a 31st in them.

I need help solving a proof! (Please Help)

The problem states: Using the fact that the square root (k), with k in positive integers, is a rational number if and only if k is a square, prove that the square root (9n+6n+4) is irrational for all

Help with calculus 3 question

how do i find the unit vector that will make the dot product of that unit vector and another vector equal to a certain number? this is the problem: · u = 4, what is u? where u is the unit vector.

Can someone help me with HighSchool math

Okay so we are doing mathbits and I am on box number 9 finally the last one can someone please solve all this, right answer gets chosen as best answer. I really cant figure out number 3 or the bottom

Find the sum for each of the series

1. -10/5^nfrom n=0 to Infinity 2 (1/4^n)+(1/2)^(n-1)-1. -10/5^n from n=0 to Infinity SUM = -- 10 / [1 -- 1/5] = -- 50/4 = -- 12 1/2 2 (1/4^n)+(1/2)^(n-1) SUM = (1/4)[1 -- 1/4] + 1 / [ 1 -- 1/2] = 1/3

How to simplify (2x^2 - 4x + 2) / ((x^2 - 1)^2) to get 2 / (x + 1)^2

I have to find the derivative of f(x) = (3 - 2x - x^2) / (x^2 - 1) and I get all the way to (2x^2 - 4x + 2) / ((x^2 - 1)^2) This is when I get stuck. The books answer says it is 2 / (x + 1)^2

Tangent line help [10 Points!!]

An equation of the line tangent to the graph of y = cos(2x)atx = pi/4? I know the derivative of cos(2x) is -2sin(2x). Where do i go from there? What do I plug in where? A step by step would be helpfu

Find the derivative of f(x)=e−7x⋅sinx

Find the derivative of f(x)=e^−7x⋅sinx i got (e^-7x)(-7)(sinx)+(cosx)(e^-7x) but its wrong. Anyone know what i did wrong?-If f(x) = [e^(-7x)] sin(x), then I agree with your calculation. If this is b

Analysis of Limits Proof

Prove or disprove that if (x_n) is convergent and lim(x_n)0 such that when n≥M, x_n Any help would be greatly appreciated! Thanks =D-Assume that the limit of {a[n]} equals L 0. Then, by the definitio

20, 16, 13, 12, 7 and the answer is 9. Using divion, multiply, add, &/or subtract

I need to know what the equation would be using those numbers to come to the Answer of 9 using any or all of the add subtract multiply divide.-((20+16)/12)+(13-7)=9 :)-What is divion?

Please tell me what is 22x^-4 y^-7 / 2x^-6 y^-3?

Please tell me what is 22x^-4 y^-7 / 2x^-6 y^-3? Thank you-22 * x^(-4) * y^(-7) --------------------------- 2 * x^(-6) * y^(-3) = 22 * (x^6) * (y^3) ------------------------ 2 * (x^4) * (y^7) =

Angle maximization problem

A picture 1.4 meters high stands on a wall so that its lower edge is 1.8 meters above the eye of an observer. What is the most favorable distance from the wall for this observer to stand (that is, to
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