Mathematics

How do I simplify this expression with trigonometric identities

(1-2sin²x)² + 4sin²xcos²x Thank you!-Given expression =1+4sin^4(x)-4sin^2(x)+4sin^2(x)cos^2(… by expanding =1+4sin^4(x)-4sin^2(x)[1-cos^2(x)] =1+4sin^4(x)-4sin^2(x)sin^2(x) using sin^2+cos^2=1 =1+4si

What percentage is my grade? 10 points!

60% of my grade is scored at 64% 25% of my grade is scored at 96% 15% of my grade is scored at 67%-72.45% is what I came up with. I didnt round it in case your grading scale doesnt round. I believe th

Zw math help! i dont know how, please help! calculus.

find ZW and Z/W leave in polar form z=1-i w=1-sqrt of 3 i i is not in the sqrt. thanks!!-Lets put them both in polar form first: z = (√2)(1/√2 - i/√2).. = (√2)(cos(-π/4) + isin(-π/4)) |w| = √(1 + 3)

How do I integrate this

How do I integrate sinx/(1+cos^2(x))? I think I should use the following rule: integration of dx/a^2 + x^2 with a = 1 and x = cos x. That would give me an answer of tan^-1 cos x. Is that right?-∫(sinx

Very easy math question!:) 10 points

Kevin wants to be entered in his schools contest to win a trip to Hawaii.In order to do that, Kevin must sell $1,000 worth of magazine subscriptions.The magazine subscriptions cost $12.95 a year.Kevin

If there are no successes in a sequence of 3 independent Bernoulli trials with p = .4 and q = .6.....

calculate the probability of the stated event. P(X = 0) =-P(X = 0) = q^3 = .216

P(A|B) = .1, P(B) = .7, P(A|B') = .5. Find P(B|A)

How do you do this?-P(A|B)=P(A intersection B)/P(B)=0.1 given P(B)=0.7 given So P(A intersection of B)=0.1*0.7=0.07 Similarly, P(A|B)=P(A intersection B)/P(B)=0.5 given P(B)=1-P(B)=1-10.7=0.3 So P(A

Finding the inverse of a matrix, please help 10pts!

[2 4 2] [2 5 2] [0 2 -1] Ive gotten up to this bit: [1 0 5 | -1/2 -2 0] [0 1 -2| 1/2 1 0] [0 0 9| -3 -6 3] I cant figure out how to get a 1 on the bottom right corner or the remaining two 0s. Help

How do you do this (Bayes' Theorem)

Y1, Y2, Y3 form a partition of S. P(X|Y1) = .8, P(X|Y2) = .1, P(X|Y3) = .1, P(Y1) = .3, P(Y2) = .2. Use Bayes theorem or a tree diagram to calculate P(Y1|X).-P(Y1 | X) = P(X Y1)/P(X) What is P(X)? It

Logarithmic problem help please.

As much as I would want someone else to help me do a lot of these math problems for me I know it would be cheating, im desperate and every homework is due tomorrow, and there are MANY problems to slov

Probability and counting

1) If two indistinguishable dice are rolled, what is the probability of the event {(1, 1), (5, 1), (6, 1)}?Answer in fraction form 2. What is the corresponding event for a pair of distinguishable di

How to score good marks in mathematics subject

Now im scoring very low marks in my maths subject(b.e-cse).Im afraid of it.I Dont score good marks even in my school days too .Tell me some tips and suggestions to score good marks.-Workout problems w

Need help figuring out my average for Math

The first quiz I made a 30 out of 30, is that a 100? I made a 92 out of 92 for one of the quizzes, is that considered a 100? I also made an 80 out of 84 for another quiz, what is that considered? If

How do you share money in a ratio? - Maths Problem

For example how do you share £40 with a ratio of 2:3 Could you show workings please?-Basically your saying : Divide £40 in the ratio 2:3 2 + 3 = 5 £40 / 5 = £8 2 * £8 = £16 3 * £8 = £24 So your

Help suppose that f(x) = 2^x what is f(3)? what point is on the graph of f

f(3) = 2^3 = 8 point (3, 8)