Questions on Algebra: Trigonometry answered by real tutors!

Tutors Answer Your Questions about Trigonometry-basics (FREE)

Question 519689: Prove that the following equations is an Identity
(1- tanA)^2= sec^2A-2tanA
Click here to see answer by lwsshak3(6742)

Question 519644: how do you graph y= a sin b(x+2pie)+d
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Question 521601: Exact value of cos^-1(tan(3pie/4))
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Question 519428: Given that x is an acute angle such that COSx=3/5 .
Find SIN3x .
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Question 518238: Not quite understanding what they are asking please help
Use the equation to determine f(x)=0
f(x)=-3cos(pie x - pie/2)-2
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Question 516964: Not quite understanding what they are asking please help
Use the equation to determine f(x)=0
f(x)=-3cos(pie x - pie/2)-2
Click here to see answer by lwsshak3(6742)

Question 522730: The minute hand of a clock is 11 inches long. How far does the tip of the minute hand move in 25 minutes?
Click here to see answer by htmentor(806)

Question 522763: Find all solutions of the equation in the interval [0, 2pi).
sin(2x)=((-sqrt(3))/2)
Click here to see answer by Alan3354(31487)

Question 522806: If x is measured in radians, then the derivative of Sin[x] with respect to x is Cos[x].
Use the formula Sin [x degrees] = Sin [2π/360 x radians]
to calculate the derivative of Sin [x degrees] with respect to x.
Why does the resulting formula make calculus difficult if you insist on working with degrees instead of radians?
Thanks for any help you can offer!
Click here to see answer by Alan3354(31487)

Question 522875: If tanx=-1/3 ; cosx>0 then
sin2x=
cos2x=
tan2x=
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Question 522884: SOlve 3sin(2a)-2cos(a)=0 for all solutions
a=

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Question 522880: Using a double-angle or half-angle formula to simplify the given expressions.
a) IF cos^2(22 degrees)-sin^2(22 degrees)=cos(A degrees), then
A=
b) IF cos^2(2x)-sin^2(2x)=cos(B), then

B=
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Question 522970: how can i solve without a calculator the exact value of tan (23pie/4) ??
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Question 522871: solve sin(5x)cos(8x)-cos(5x)sin(8x)=-0.5 for the smallest positive solution.
x=
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Question 523002: I am doing AS maths, and I need your help.
Solve the following equation for 0 < theta < 2pi, giving your answers as multiples of pi.
i) costheta = surd 3/ 2
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Question 523040: How do you complete the square of the quadratic expression: ?
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Question 523075: How do you write this number in terms of i: ?
Click here to see answer by ankor@dixie-net.com(15745)

Question 523104: Solve the equation on the interval 0 < theta < 2pi
cot 2theta/3 = -sqrt3
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Question 523103: Solve the equation on the interval 0< theta < 2pi
sec^2theta+tan theta=0
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Question 523100: Solve each equation on the interval 0 1-cos theta= 1/2
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Question 523582: solve sin(5x)cos(8x)-cos(5x)sin(8x)=-0.5 for the smallest positive solution.
give answer accurate to two decimal places
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Question 523736: tan[sin^-1(-3/5)+cos^-1(1/2)]
Click here to see answer by lwsshak3(6742)

Question 523753: Question:find two values of theta that saitisfy each of the equations below. Give your answers in radians
(0 < theta < or equal to 2 pi)
a. sin theta = - sqrt ( 2 )/ 2
b. sec theta = - 2 sqrt ( 3 )/ 3
Click here to see answer by lwsshak3(6742)

Question 523797: If sin^2(π/9) + sin^2(2π/9) + sin^2(3π/9) + sin^2(4π/9) = 9/4 , evaluate
cos^2(π/9) + cos^2(2π/9) + cos^2(3π/9) + cos^2(4π/9).
Click here to see answer by Alan3354(31487)

Question 523850: A sprocket 3.16 inches in diameter is driven by a chain that moves at a speed of 55.5 in./s. Find the angular velocity of the sprocket in rev/min.

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Question 523858: If possible, find a solution to tan(2theta+7)=8
So find theta
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Question 523713: verify that sec(x)= sin^2(x)/cos(x)+ cos(x)
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Question 523472: are there two angles between 0 and 2pi with a tangent of 4
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Question 523394: tan(sin^-1(3/5))
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Question 524255: solve cos(56°-3x)=-0.79 in the range 0 < x < 360°
Click here to see answer by Edwin McCravy(8999)

Question 524591: one negative and one positive angle tht are coterminal with each other
-2Pi/5
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Question 524729: Approximate to the nearest degree, the solutions of the equation in the interval [0°, 360°).
(8cot(x)+1)(cos(x)-4)=0
Click here to see answer by stanbon(57940)

Question 524726: Find the EXACT solutions of the equation sin(x)+2cos^2(x)=1 that are in the interval [0, 2π).
Click here to see answer by lwsshak3(6742)

Question 524724: Approximate to the nearest degree, the solutions of the equation in the interval [0°, 360°).
6cos^2(x) = 11sin(x)+4
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Question 524888: how to graph 3tan3x
Click here to see answer by stanbon(57940)

Question 525073: verify: (1-sin x)/(1+sin x)=(sec x-tan x)^2
Click here to see answer by lwsshak3(6742)

Question 525104: My question is:
Suppose that you did not have a unit circle on the circle, but instead a circle with the radius of 5. Will the angle measure in degrees and/or radians change? Why or why not?
Please help. I think that it does NOT change but I'm not absolutely sure and I do not know how to explain it.
Click here to see answer by lwsshak3(6742)

Question 525248: Solve the equation on the interval 0 < theta < 2pi
cos^2 theta-sin^2 theta+sin theta=0
Click here to see answer by tarungehlot(8)

Question 525245: Solve the equation on the interval of 0 < theta <2pi
sqrt 3 sin theta+cos theta=1
Click here to see answer by solver91311(17059)

Question 525359: cos(t)=-3/5 where pi Note: Give exact answers, do not use decimal numbers. The answer should be a fraction or an arithmetic expression. If the answer involves a square root it should be enter as sqrt; e.g. the square root of 2 should be written as sqrt(2).
Click here to see answer by Alan3354(31487)

Question 525332: I need to solve the triangle using the labels. I also need to round lengths of the sides to three sig digits and angles to the nearest tenth of a degree.
A = ?
B= ?
C = 108.5
a= 415 m
b = 325 m
c = ?
Click here to see answer by Edwin McCravy(8999)

Question 525637: A certain town is at a latitude of 35.2 degrees N. Find the distance in miles from the town to the north pole.
Click here to see answer by Alan3354(31487)

Question 525769: The minute hand of a clock is 6 inches. How far does the minute hand travel in 20 minutes? What is the are swept out by the minute hand in 20 minutes? What equations do I use?
Click here to see answer by josmiceli(9817)

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