Recent Homework Questions About Trigonometry
Trig-Medians and law of cosines and sines
In triangle ABC, we have AB=3 and AC=4. Side BC and the median from A to BC have the same length. What is BC? Not making sense to me, I think the answer must be simple, but I don't know how to solve I applied the law of sines but to no avail. Help is appreciated, thanks.
Wednesday, November 20, 2013 at 11:53am
since sin(34) = cos(56) sin(48) = cos(42) the expression evaluates to 2
Tuesday, November 19, 2013 at 10:18pm
Trig - Law of sines and cosines
I started with AB, the vertical diagonal of the square. I then drew square ALMN At M, I drew the base BC of the equilateral triangle perpendicular to AM, letting BM = MC = 2 Joi AB and AC for the triangle. Let the intersection of ML and AB be P, and the intersection of MN and ...
Tuesday, November 19, 2013 at 8:09pm
√(100+100cot^2 x) √(100(1+cot^2 x)) √(100csc^2 x) 10cscx
Tuesday, November 19, 2013 at 8:02pm
these are all done the same way. You have to solve a quadratic in some trig function. #1. 2sec^2 4x - 3sec 4x - 5 = 0 (2sec 4x - 5)(sec 4x + 1) = 0 So, sec 4x = 5/4 or sec 4x = -1/4 There are two angles for each solution in [0,360°) where this is true. But that means there...
Monday, November 18, 2013 at 8:59pm
1) The period of a trig. function y=sin kx is 2pi/k. Then period of y=sin^2(pi.x/a) should be 2pi/(pi/a)=2a, but somewhere it is given as a. Which is correct? 2) The period of r=sin^3(theta/3) is given as 3pi. How is it worked out? Is it because after theta=0, the function ...
Monday, November 18, 2013 at 12:18am
V1 + V2 = 1200[70o] + 900[205o] X = 1200*cos70 + 900*cos205 = -405.3 Y = 1200*sin70 + 900*sin205 = 747.3 tanAr = Y/X = 747,3/-405.3 = -1.84376 Ar = -61.53o = Reference angle. A = -61.53 + 180 = 118.5o Vr = Y/sinA = 747.3/sin118.5 = 850.3[118.5o] = Resultant vector.
Friday, November 15, 2013 at 8:57am
the resultant velocity is 320.0 mph @ 103° so, now you know how far it goes in 4 hours.
Friday, November 15, 2013 at 1:14am
Dunno what E is, but sounds like you just want to add two vectors. Bad news is you gotta convert to rectangular coordinates to do that.
Friday, November 15, 2013 at 12:37am
Algebra 2 Trig - Probability Question
help solving a probability problem: probability that a person taking a survey is male "given" that he preferred a European automobile if 112 males prefer european autos out of 188, and 216 of a total of 452 individuals were surveyed were male. Additional information...
Thursday, November 14, 2013 at 9:13am
The magnitude of the resultant R is R^2 = 650^2 + 300^2 R = appr 715.89 if Ø is the angle it makes with the longer vector, then tanØ = 300/650 = ... Ø = appr 24.8°
Wednesday, November 13, 2013 at 7:35pm
Trigonometry - Identities and proof
Two of the standard conversion formulas are: sinA - sinB = 2sin((A-B)/2) cos( (A+B)/2) and cosA - cosB = - 2sin( (A-B)/2) sin( (A+B)/2) see: near bottom of page under: Sum-to-Product Formulas http://www.sosmath.com/trig/Trig5/trig5/trig5.html RS = -(sinx - siny)/(cosx...
Wednesday, November 13, 2013 at 11:23am