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Tutors Answer Your Questions about Trigonometry-basics (FREE)
Question 203109: i was wondering how you do these problems: The directions are to find the exact value of each expression.
6 cos 3π/4+ 2tan(-π/3)
and
sec ( -π/3)- cot (-5π/4)
please i am struggling to do this work. I would appreciate if you would explain in detail. Thank you in advance.
Click here to see answer by jim_thompson5910(13794)   |
Question 203931: could you guide me about this? I dont have any idea to solve this kind of exercises and I don't know what do I have to do.Thanks.
Use the fundamental identities to find all of the trigonometric ratios if the variable satisfies the given conditions.
a) sin x=12/13 and cos x<0
b)cos x =-4/3 , sinx>0
c)tan x = -24/7 , sinx>0
d)tan x = 4/3 , sinx>0
e)cot x= 4 , sinx>0
f)cos x=3/5
p.s: I've written all cause I've thought maybe there are different points.
Click here to see answer by Alan3354(6092)  |
Question 203931: could you guide me about this? I dont have any idea to solve this kind of exercises and I don't know what do I have to do.Thanks.
Use the fundamental identities to find all of the trigonometric ratios if the variable satisfies the given conditions.
a) sin x=12/13 and cos x<0
b)cos x =-4/3 , sinx>0
c)tan x = -24/7 , sinx>0
d)tan x = 4/3 , sinx>0
e)cot x= 4 , sinx>0
f)cos x=3/5
p.s: I've written all cause I've thought maybe there are different points.
Click here to see answer by Edwin McCravy(2922) |
Question 203981: Could you guide me to solve and understand this?
Find the value(s) or range of values of K for which the lin y=2x+k
a) touches
b) cuts in real points
c)does not meet
the curve 2x^2+y^2=4
p.s: I thought maybe it's easier if I draw the circle and decide for the domain of K but I couln't do any thing with the coefficient of x^2 and I also couln't find any note about drowing a circle like mine.
What is more could you guide me if there is any automatic drawer in this site to draw the graph of trigonimic equations or equations like this ?
Click here to see answer by vleith(1977) |
Question 204473: Hi, I was hoping you can help me on this,
4. Write an equation for the graph of y=x^2 that has been vertically expanded by a factor of 4, horizontally compressed by a factor of 1/5 , reflected across the y-axis, translated 3 units to the right, and up 4 units.
Click here to see answer by stanbon(26291) |
Question 204615: Jacqueline is checking her bicycle’s wheel. The wheel has a radius of 20 cm, and its center is 51 cm above the ground. Jacqueline is rotating the wheel at a constant speed of 225°/s. The height of a point on the tire as a function of time is given by h = 51 + 20 sin(225t), where h is the height in centimeters and t is the time in seconds. Find h when t = 19 s. Find your answer to the nearest tenth of a centimeter.
Click here to see answer by Earlsdon(4900) |
Question 204635: hi i am really having trouble with converting rectangular coordinates to polar coordinates because i first have to graph the points and find four different ways to express those points with differing angles.
the points that i am having trouble with are (-10,-10)
Click here to see answer by Alan3354(6092) |
Question 204635: hi i am really having trouble with converting rectangular coordinates to polar coordinates because i first have to graph the points and find four different ways to express those points with differing angles.
the points that i am having trouble with are (-10,-10)
Click here to see answer by Edwin McCravy(2922) |
Question 204651: hi i am really having trouble with converting rectangular coordinates to polar coordinates because i first have to graph the points and find four different ways to express those points with differing angles.
the points that i am having trouble with are (-8,-15)
Click here to see answer by Alan3354(6092) |
Question 204836: THE PRICE OF AN ITEM IS GIVEN BY THE FOLLOWING POLYNOMIAL: P=3X-4 WHERE X IS THE NUMBER IF ITEMS SOLD.
REVENUE IS FOUND BY MULITPLYING THE PRICE BY THE NUMBER OF ITEMS SOLD. WRITE THE POLYNOMIAL REPRESENTING THE REVUNUE..
MY ANSWER: R=P(3X-4)
Click here to see answer by rfer(2688) |
Question 204836: THE PRICE OF AN ITEM IS GIVEN BY THE FOLLOWING POLYNOMIAL: P=3X-4 WHERE X IS THE NUMBER IF ITEMS SOLD.
REVENUE IS FOUND BY MULITPLYING THE PRICE BY THE NUMBER OF ITEMS SOLD. WRITE THE POLYNOMIAL REPRESENTING THE REVUNUE..
MY ANSWER: R=P(3X-4)
Click here to see answer by MathTherapy(336) |
Question 204821: Hi, I was hoping you can help me on this:
Two students standing 3000M apart see the same airplane flying in the sky between them. Student A measures the angle of elevation to be 37 degrees. Student B measures the angle of elevation to be 30 degrees. How high is the airplane.
Click here to see answer by ankor@dixie-net.com(6693)  |
Question 204822: Urgent request. Can you help me solve this problem:
1) The concentration of salt in Lake Ontario doubles every 7.25 years. If the current levels are 312.5 parts per million, a) Find an expression for the concentration of salt in Lake Ontario after n years.
b) The concentration levels of salt in the Dead Sea are 10 000 parts per million. How long will it take for the concentration of salt to reach these levels in Lake Ontario?
Click here to see answer by ankor@dixie-net.com(6693) |
Question 205030: Evaluate cos((7pi)/8)
I have this so far
cos^2 theta=(1/2)(1+cos(2theta))
cos((7pi/8))= sqroot((1+cos(7pi/4))/2)
= sqroot((1+ ((sqroot2)/2))/2)
=sqroot((2+sqroot2)/4)
=(1/2)(sqroot(2+sqroot2))
but it is marked wrong, is there supposed to be a negative somewhere?
Thank You
Click here to see answer by Edwin McCravy(2922) |
Question 205078: A woman standing on a hill sees a flagpole that she knows is 60 ft tall. The angle of depression to the bottom of the pole is 14 deg and the angle of elevation to the top of the pole is 18 deg. Find her distance x from the pole.
Click here to see answer by stanbon(26291) |
Question 205115: Two cyclists leave the corner of State Street and Main Street simultaneously. State Street and Main Street are not at right angles; the cyclists' paths have an angle of 45o between them. How far apart are the cyclists after they each travel 7 miles? Hint: Use the Law of Cosines
Can you explain how the law of cosines works and how it would apply to this problem?
Thank You
Click here to see answer by Alan3354(6092) |
Question 205115: Two cyclists leave the corner of State Street and Main Street simultaneously. State Street and Main Street are not at right angles; the cyclists' paths have an angle of 45o between them. How far apart are the cyclists after they each travel 7 miles? Hint: Use the Law of Cosines
Can you explain how the law of cosines works and how it would apply to this problem?
Thank You
Click here to see answer by Theo(675)  |
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