ZeHanz
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I'm a high school maths teacher from Holland.
I like to help people with maths questions! Many times I learn from it too, because the topics from all over the world are more varied than those from my country alone.
OpenStudy saves me from getting rusty...
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Questions Answered
tori22:
Group Title
solve ∫e^-x(cosx)dx
updated 9 months ago
2 replies
No Medals Yet
Mathematics
tori22:
Group Title
Find the indefinite integral (xe^x)dx
updated 9 months ago
22 replies
1 Medal
Mathematics
Pilot26:
Group Title
verify the idenity? (acost-bsint)^2+(asint+bcost)^2=a^2+b^2
updated 9 months ago
12 replies
1 Medal
Mathematics
mason22:
Group Title
Help please what's the factored form of the expression w^2 + 12w + 36
updated 9 months ago
2 replies
1 Medal
Mathematics
kellyjo86:
Group Title
Evaluate the following. Answers must be in EXACT VALUES!!!
sin^(-1)(sin〖-135°〗 )
…
updated 9 months ago
21 replies
1 Medal
Mathematics
yomylola:
Group Title
please help
Rewrite 1−cos135 sin135 using a half-angle identity.
updated 9 months ago
13 replies
1 Medal
Mathematics
Itzrosey:
Group Title
What are the next two terms to the following sequence... 1, 5, 9
updated 9 months ago
5 replies
1 Medal
Mathematics
MiaKitty1:
Group Title
Can someone create for me an exponential function that increases gradually? :)
updated 9 months ago
13 replies
2 Medals
Mathematics
Jayclaw:
Group Title
I got the answer for x^2/4 + 4=0 but the answer was
4i, 4i what does that mean?
updated 9 months ago
3 replies
No Medals Yet
Mathematics
RolyPoly:
Group Title
Why do we use radian instead of degree in "higher mathematics", for example, in calculus?
updated 9 months ago
9 replies
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Mathematics
Sandsand22:
Group Title
A region R is enclosed by the coordinate axes and the graph of y=k(x-5)^2, k>0. When this region is revolved around the x-axis, the solid fo…
updated 9 months ago
30 replies
2 Medals
Mathematics
rhenry:
Group Title
How do you disprove the following: If x squared equals 5x then x=5
updated 9 months ago
12 replies
2 Medals
Mathematics
Greytears:
Group Title
I gotta go to a wedding in like less than 16 mins and I'm stuck on homework. :(
HELP PROVE:
(cscx(cosx+sinx)^2)/1+sin2x = cotx/cscx
updated 9 months ago
7 replies
1 Medal
Mathematics
marta17:
Group Title
9^lnx-4*3^lnx+1 + 27=0
updated 9 months ago
5 replies
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Mathematics
katieeeeeeee:
Group Title
Given the set {A, B, C}, how many permutations and combinations are there of this set of 3 objects taken 2 at a time?
updated 9 months ago
13 replies
1 Medal
Mathematics
Shenell1:
Group Title
I need help with algebra.
updated 9 months ago
4 replies
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Mathematics
dg98:
Group Title
Trig equations: find solutions of 3sin^2x-sinx-2=0 in the interval [-pi,pi]. what does the interval mean?! I know how to do the equation par…
updated 9 months ago
5 replies
1 Medal
Mathematics
krackhead992:
Group Title
tan(sin^-1(-5/13))
updated 9 months ago
10 replies
No Medals Yet
Mathematics
laniraegreen:
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help! calculus question
updated 9 months ago
9 replies
4 Medals
Mathematics
katieeeeeeee:
Group Title
A deer is born with the ability to smell predators better than the other deer in its population. As a result, this deer has several seconds …
updated 9 months ago
5 replies
1 Medal
Mathematics
September1620:
Group Title
Could someone please explain to me how they got this answer?
(√2/2)/(1+√2/2) = √2/(2+√2)
updated 9 months ago
7 replies
No Medals Yet
Mathematics
katieeeeeeee:
Group Title
Which of the following examples likely occurred through natural selection?
updated 9 months ago
8 replies
2 Medals
Mathematics
Biha:
Group Title
Integrate (x+4)(4-x)/3x^2 dx
updated 9 months ago
10 replies
2 Medals
Mathematics
shaye25:
Group Title
find the exact value of tan(arccos(-2/3))
updated 9 months ago
6 replies
1 Medal
Mathematics
M0j0jojo:
Group Title
In oil pipeline construction, the cost of pipe to go underwater is 60% more than the cost of pipe used in dry-land. A pipeline comes to a ri…
updated 9 months ago
9 replies
1 Medal
Mathematics
pleasee_x_help:
Group Title
How do you find the average between the two numbers 25 and 26?
FAN AND MEDAL
updated 9 months ago
3 replies
No Medals Yet
Mathematics
This_Is_Batman:
Group Title
Find the exact value by using a half-angle identity.
cos(-pi/8)
updated 9 months ago
25 replies
1 Medal
Mathematics
washcaps:
Group Title
MEDAL!! Give an example of a real number for t for which cos t is positive and sin t is negative.
…
updated 9 months ago
25 replies
2 Medals
Mathematics
Luigi0210:
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Evaluate the limit analytically:
…
updated 9 months ago
18 replies
6 Medals
Mathematics
rational:
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tough question stats Help !
updated 9 months ago
70 replies
2 Medals
Mathematics
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