Recent Homework Questions About Trigonometry
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
absolute means global. It's possible to have several relative extrema, and some, all, or none may be absolute extrema. A parabola has one relative extremum, which is absolute. A cubic such as y=(x-1)(x-2)(x-3) has two relative extrema, but no absolutes at all, since the ...
Sunday, November 10, 2013 at 4:11pm
it doesn't infer anything, though you may infer that it's a problem involving the first quadrant. Or a problem on acute triangles Or principal values of trig functions . . .
Thursday, November 7, 2013 at 9:25am
Show that if A, B, and C are the angles of an acute triangle, then tan A + tan B + tan C = tan A tan B tan C. I tried drawing perpendiculars and stuff but it doesn't seem to work? For me, the trig identities don't seem to plug in as well. Help is appreciated, thanks.
Wednesday, November 6, 2013 at 5:21pm
Math - Trigonometry
If sin theta +cos theta =1.2, then what is sin^3 theta + cos^3 theta? Hmm...I don't understand how to proceed. I know I must apply a trig Identity, but which one? Thanks in advance
Tuesday, November 5, 2013 at 10:26pm
I will read that as sin (x/7) = -√3/2 since √3/2 is one of the trig values I recognize So x/7 must be in quadrants III or IV I know sin 60° = +√3/2 so my angle in "standard position " is 60° x/7 = 180+60 = 240 x = 1680° or x/7 = 360-60...
Monday, November 4, 2013 at 3:03pm
MATH ANALYSIS & TRIG
as usual, draw a diagram. Al's distance a is 6+10t Barb's distance b is 2+5t d^2 = (6+10t)^2 + (2+5t)^2 = 5(25t^2 + 28t + 8) Now just set dd/dt=0 to find the minimum.
Tuesday, October 29, 2013 at 11:25pm
Math - Trigonometry
doesn't matter. All of the trig functions are positive in exactly 2 of the 4 quadrants.
Tuesday, October 15, 2013 at 11:12am
yes it is.
Tuesday, October 15, 2013 at 10:07am
Calculus - please help!
we have 4x^2 + 9y^2 = 36 The line x=3 lies at one end of the ellipse, so shells are probably the way to go. The volume v is thus v = ∫[-3,3] 2πrh dx where r = 3-x and h = y = √(36-4x^2)/3 v = 2π/3 ∫[-3,3] (3-x)√(36-4x^2) dx Now just break it ...
Friday, October 11, 2013 at 12:02pm
Math - Trig
Did you make sure your calculator was set to Radians ? (press DRG until you see RAD displayed) Here are my keystrokes .5 x 12 - 2 = sin = x 20 + 40 = and you should get 24.86° (Of course you can see that since sin(????) ranges from -1 to +1, the temperature must range from...
Thursday, October 10, 2013 at 12:46am
Monday, September 24, 2012 at 6:40pm
Sunday, November 28, 2010 at 5:47pm
hey ted did you ever figure that out because if so tell me tell me now plz i need this very much
Monday, November 17, 2008 at 9:36pm