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Tutors Answer Your Questions about Trigonometry-basics (FREE)
Question 167479: Hello, i was given a problem by my teacher and did not understand it:
When 0.5 cm was planed off of each of the 6 faces of a wooden cube its volume decreased by 169 cm^2. Find its new volume.
Thank You.
Click here to see answer by gonzo(654)   |
Question 167475: Hi, this problem was made up by trigonometry teacher, can you please help me.
If a particle starting with an initial speed V0 has constant acceleration,a,then its speed after t seconds is given by V=V0+at. Find V0 and a if V= 28 mi/s when t=4. And then when V=43 mi/s and t=7s.
Click here to see answer by Mathtut(3670) |
Question 167547: Hello all! I have this Trigonometry homework that is killing me and I need help from you guy's. Here's the problem let me know if you guys can solve it.
1. Calculate the derivatives:
I) I) (Sin4x) /( x² +1)
II) II) 10t²+1
III) III) √ ( 1 + u) / (1 – u)
IV) IV) (1) / ( x4 + 1)3
2. Calculate the points of the tangent of the curve : y = ex(x2 – 8) where and in which the tangent line is horizontal
3. Write one of the two tangents to the curve : y = 1 + x³ which are parallel to this equation 12x - y = 1.
4. Calculate
I) If f(x) = ex cos x calculate f ’(x) et f ’’
(ii) Calculate (d99/ dx99) Sin x
5.
Calculate the derivative :
I) y = xe-x²
II) Let say: r(x) = f(g(h(x))) whit h(1) = 2, g(2) = 3, h’(1)= 4, g’(2) = 5, f’(3) = 6. Calculate r’(1).
III) Show that the function : y = Ae-x + Be-x satisfy the equation with differential y”+ 2y’+y = 0
Click here to see answer by sowmya(32) |
Question 167705: Hi. My teacher gave me this problem and i dont understand it:
The general formula for the height, h, after t seconds of a projectile launched upward from the ground level with initial speed, v is h=vt-1/2gt^2 where g is the gravatational constant (9.8 m/s^2 or 32 ft/s^2). Show that the greatest height of the projectiles is v^2/2g.
thanks.
Click here to see answer by jim_thompson5910(13794) |
Question 167705: Hi. My teacher gave me this problem and i dont understand it:
The general formula for the height, h, after t seconds of a projectile launched upward from the ground level with initial speed, v is h=vt-1/2gt^2 where g is the gravatational constant (9.8 m/s^2 or 32 ft/s^2). Show that the greatest height of the projectiles is v^2/2g.
thanks.
Click here to see answer by Earlsdon(4900) |
Question 167728: Verify this identity :
(tan^2(x)-1)/(1+tan^2(x)) = 1-2cos^2(x)
I've started a couple different options but none are working out for me. Here is what I have so far :
A)
multiply top by (1 + tan^2(x)) to get :
tan^4 (x) -1 or (tan^2(x)+1)(tan^2x-1)
then i'm stuck!
B) (tanx +1)(tanx-1)/1 + tan^2(x) =
(sinx/cosx + 1)(sinx/cosx - 1) / 1/cosx
then again I'm stuck!
I'm not sure if I should be working on the right side of the equation instead! Grrrrr....I could get a little help from the tutors in the Math Lab on campus but we've been instructed not to seek them out for this problem (and another I am stuck on!). Any tips would be helpful and thank you in advance for your time!!
Desperately seeking solution, Rebecca
Click here to see answer by jim_thompson5910(13794) |
Question 167730: Verify this identity :
sin4x = (cosx)(4sinx-8sin^3x)
Here is what I've shamefully accomplished so far :
=(cosx)4sinx(1-2sin^2x)
=(cosx)4sinx(cos2x)
=(cos3x)(4sinx)
=???????
Now I'm stuck! Any insight would be appreciated greatly! Thank you in advance for your time!!
Desperately seeking solution, Rebecca
Click here to see answer by jim_thompson5910(13794) |
Question 167747This question is from textbook Algebra 1
: Hello! The question I need help on says: On September 30, 1995, the Ohio State Buckeyes defeated the Notre Dame Fighting Irish in football as a blimp relayed aerial viewes from above. Suppose the blimp was directly over the 50-yard line. A photograper on the ground estimated the angle of elevation to be 85 degrees when she was 65 yards away from the point on the ground directly under the blimp. How high is the blimp? Round your answer to the nearest foot.
If you could show me step by step that would be great!
Thank You!This question is from textbook Algebra 1
Click here to see answer by nerdybill(2448)  |
Question 167747This question is from textbook Algebra 1
: Hello! The question I need help on says: On September 30, 1995, the Ohio State Buckeyes defeated the Notre Dame Fighting Irish in football as a blimp relayed aerial viewes from above. Suppose the blimp was directly over the 50-yard line. A photograper on the ground estimated the angle of elevation to be 85 degrees when she was 65 yards away from the point on the ground directly under the blimp. How high is the blimp? Round your answer to the nearest foot.
If you could show me step by step that would be great!
Thank You!This question is from textbook Algebra 1
Click here to see answer by stanbon(26297) |
Question 167752This question is from textbook Algebra 1
: Hello! My question says: The largest of the pyramids of Egypt has a square base with sides 755 feet long. Angles PQR has a mesure of 52 degrees. The top of the pyramid is no longer there. What was the pyramid's oringinal height RP to the nearest foot?This question is from textbook Algebra 1
Click here to see answer by stanbon(26297) |
Question 167754This question is from textbook Algebra 1
: Hello! My problem is a triangle with a measure of an acute angle A which is 29 degrees, side CA of 18 meters, and a right angle which is angle C. Here's what I found out so far:
that angle b = 61 degrees
but I do not know how to figure out CB and BA
if you could help, please show step by step instuctions to help me.
Thank You!This question is from textbook Algebra 1
Click here to see answer by stanbon(26297) |
Question 167929This question is from textbook Algebra 1
: Hi! My problem shows a triangle that has angle A a 21 acute degree angle, sides AC is 13 inches, and is a right triangle.
What I have figured out:
angle B = 61 degrees
and sides CB = 5 inches
What I need:
sides AB
Thank You!
This question is from textbook Algebra 1
Click here to see answer by jojo14344(1483) |
Question 168096: I'm Having hard time solving this homework. Can anyone help?
2. Calculate the points of the tangent of the curve : y = ex(x2 – 8) where and in which the tangent line is horizontal
3. Write one of the two tangents to the curve : y = 1 + x³ which are parallel to this equation 12x - y = 1.
4. Calculate
I) If f(x) = ex cos x calculate f ’(x) et f ’’
(ii) Calculate (d99/ dx99) Sin x
5.
Calculate the derivative :
I) y = xe-x²
II) Let say: r(x) = f(g(h(x))) whit h(1) = 2, g(2) = 3, h’(1)= 4, g’(2) = 5, f’(3) = 6. Calculate r’(1).
III) Show that the function : y = Ae-x + Be-x satisfy the equation with differential y”+ 2y’+y = 0
Click here to see answer by oscargut(682)  |
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