# Questions on Algebra: Trigonometry answered by real tutors!

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 Algebra: Trigonometry Solvers Lessons Answers archive Quiz In Depth

 Question 205262: Having trouble can not figure this out for f(x,y)=3x^2y^5+6x^6y^2 compute fxx(1,-1) = fxy(2,2)= fyy(-1,-1) = thanks so much for help Click here to see answer by Edwin McCravy(8909)

 Question 205342: Heres the question in the book: . Find the exact value of the following expression. Do not use a calculator. sin105cos15 Any help with this would be much appreciated. Click here to see answer by stanbon(57361)

 Question 205660: Simplify the following, where k represents any integer. cos(2kpi-theta)(-sin(2kpi-theta)) Click here to see answer by stanbon(57361)

 Question 205832: Solve the following equations in the interval [0,2]. Note: Give the answer as a multiple of pi. Do not use decimal numbers. The answer should be a fraction or an integer. Note that pi is already included in the answer so you just have to enter the appropriate multiple. E.g. if the answer is pi/2 you should enter 1/2. If there is more than one answer enter them separated by commas. sin(t) = -sqrt3/2; t = ? pi sin(t) = 1/2; t = ? pi Click here to see answer by Alan3354(30993)

 Question 205834: Let y = -2cos(3(x-pi/2)). What is the amplitude?? What is the period?? For the phase shift, which way is the graph shifted? How far is it shifted? (Note: you can enter pi in the answer if applicable) Click here to see answer by stanbon(57361)

 Question 205833: Evaluate the following expressions. Note: Your answer must be in EXACT form: it cannot contain decimals. It must be either an integer or a fraction. If the answer involves a square root write it as sqrt . For instance, the square root of 2 should be written as sqrt(2). sin(-2pi/3) = ? cos(pi/2) = ? tan(pi/6) = ? cot(pi/2) = ? sec(4pi/3) = ? csc(-pi/6) = ? Click here to see answer by stanbon(57361)

 Question 205909: why does sin(theta + pi/2)= + cos theta ? Click here to see answer by stanbon(57361)

 Question 205921: The question: express theta as a function of X A right triangle is shown with X as the adjacent and 7 as the hypotanus and a theta symbol at the bottom left angle. What exactly is this question asking? Do I just need to solve the triangle? Any help with this would be much appreciated. Thank you so much for your time. Click here to see answer by stanbon(57361)

 Question 205976: sheila practiced 1 1/2 hours monday, 3 3/4 hours tueday, and 2 1/4 hours wednesday. what is the toatl number of hours that she practiced? Click here to see answer by RAY100(1637)
 Question 205976: sheila practiced 1 1/2 hours monday, 3 3/4 hours tueday, and 2 1/4 hours wednesday. what is the toatl number of hours that she practiced? Click here to see answer by nerdybill(6962)

 Question 205950: how do you find the domain and range of these without a calculator? y=2sinx y=secx+2 y=sin|x| ln(x-2) Click here to see answer by mickclns(59)

 Question 206372: Solve for x in the equation 3sin^2x = cos^2x; 0 3 sin squared x = cos squared x where x is greater than or = 0 and less than or = 2pi Thank you so much for your help! Click here to see answer by stanbon(57361)

 Question 206389: cos^2x - sin^2x = sin x with x greater than negative pi and less than or = pi Click here to see answer by stanbon(57361)

 Question 206557: find exact value of CSC 210 degrees without using a calculator or the unit circle? Click here to see answer by stanbon(57361)

 Question 206573: find acute angle a if tan sgaure A+cot square A=2 Click here to see answer by stanbon(57361)

 Question 206765: In a quadrilateral ABCD, AB=3cm, BC=5.7cm, CD=4cm and AD=4cm. AngleB=angle D=90 degree. Calculate the angle at A to 1 decimal place. This question is from the chapter trigonometry:Tangent ratios. Please do help me solving this question. It is really difficult for me. Thankyou very much indeed! Click here to see answer by mickclns(59)

 Question 206572: solve for the exact value of x where 0 greater than or equal to X and less than/equal to 2 pi. cos^2 x-1=0 I did the factoring and FOILing and The two answers I got were: cosx=-1 cosx=1 x=pi x=0,2pi According to my instructor cosx=1's answers are not completly correct. I dont see what the problem is since cos(0) and cos(2pi) both =1. Am I missing something here? Thank you for your help. Click here to see answer by mickclns(59)

 Question 206805: In a quadrilateral ABCD, AB=3cm, BC=5.7cm, CD=4cm and AD=4cm. AngleB=angle D=90 degree. Calculate the angle at A to 1 decimal place. This question is from the chapter trigonometry:Tangent ratios. I know that this question had already been solved,but the answer of this question is 101 as written at the back side of my course book. It would certainly be a great pleasure for me if you solve my question again. Once again thankyou very very much! Click here to see answer by vleith(2825)

 Question 206815: Draw an equilateral triangle and bisect it. Prove that the exact value of the tangent ratios of 30 degree, 45 degree and 60 degree are 0.577, 1,and 1.73, respectively. Please solve this question. It is from the chapter of trigonometry:Tangent ratios.Thank you very much indeed! Click here to see answer by RAY100(1637)

 Question 206932: Draw an equilateral triangle and bisect it. Prove that the exact value of the tangent ratios oif 30 degree, 45 degree, and 60 degree are 0.577, 1, and 1.73 respectively. Kindly solve this question. It is really urgent for me! Thankyou very much indeed. Click here to see answer by stanbon(57361)

 Question 207158: true or false. 1) sin θ = 1/cscθ, where sin θ ≠ 0. i thought it was true. 2) cos θ = 1/secθ, where cos θ ≠ 0. i thought it was true. thanks :] Click here to see answer by jim_thompson5910(28595)

 Question 207227: A intitial investment of \$10,000 grows at 11% per year. What function represents the value of the investment after t years? Click here to see answer by rfer(12662)

 Question 207274: A regular pentagon has sides of 10cm. Find the radius the largest circle which can be drawn inside the pentagon. Actually this question is from the chapter of Triginometry: Tangent ratios Please tell me that how could I use tangent in this particular question. I request you to solve my question as soon as possible. I would be highly glad. Thankyou very much indeed. Click here to see answer by Theo(3464)

 Question 207273: A regular pentagon has sides of 10cm. Find the radius the largest circle which can be drawn inside the pentagon. Actually this question is from the chapter of Triginometry: Tangent ratios Please tell me that how could I use tangent in this particular question. I request you to solve my question as soon as possible. I would be highly glad. Thankyou very much indeed. Click here to see answer by Edwin McCravy(8909)

 Question 207428: prove that sin^2 x ( 1 + cot^2 x ) = 1 THANK YOU!! Click here to see answer by jim_thompson5910(28595)

 Question 207434: find the exact value of cos 105degrees. without the table or calculator. Click here to see answer by stanbon(57361)

 Question 207450: find the exact value of tan 15degrees without using tables or a calculator Click here to see answer by Edwin McCravy(8909)
 Question 207450: find the exact value of tan 15degrees without using tables or a calculator Click here to see answer by jsmallt9(3296)