# Recently Active Trignometry Questions

• can someone help me solve , 2cosÎ± - 1 = sinÎ± - cosÎ±*tan( Î±/2 ) ...
replied2011-09-12 23:02:34
• in any tri.... ABC prove that... 1 < cos A + cos B + cos C <= 3/2 <= means less than or equal to nd ya.... thanks in advance .... ...
replied2011-09-01 23:07:28
• If sinx+tanx=5/6 find sinx*tanx. By converting everything to sinx we get a quartic equation but how to solve that? ...
replied2011-09-01 04:09:39
• find the maximum and minimum value of sinx(sinx+cosx). i got the minimum value as [1-âˆš2]/2 and the maximum value as [1+âˆš2]/2. want to confirm it. ...
replied2011-08-31 22:43:13
• .A square Tower stand upon a horizontal plane.from a point in this plane, from which three of its upper corners are visible, their angular elevations are respectively 45Â°,60Â°,45Â°. show that the height of the tower is to th ...
replied2011-08-29 08:21:39
• \hspace{-16}$Evaluate$\mathbf{\cos (a).\cos (2a).\cos(3a).........\cos(999a)=}$\\\\ Where$\mathbf{a=\frac{2\pi}{1999}}$... replied2011-08-28 10:48:05 •$Solve The equation $\mathbf{\sin^{10}x+\cos^{10}x=\frac{29}{16}\cos^4(2x)}$ ...
replied2011-08-28 06:40:04
• find the number of non-similar isosceles triangles such that tanA + tanB + tanC = 300. answer is an integer ...
replied2011-08-18 08:46:08
• A lighthouse, facing north, sends out a fan-shaped beam of light extending fron north-east to north-west. An observer on a steamer, sailing due west, first sees the light when he is 5 km awayfrom the lighthouse, and continues ...
replied2011-08-18 02:12:55
• *Image* which theorems we hav to use here? ...
replied2011-08-16 22:38:25
• Show that : sin5x+cos5x+sin4xâ‰¤2 for all values of x, ...
replied2011-08-15 01:18:42
• sin^3x+sin^2x+sinx=1 ...
replied2011-08-08 15:07:45
• value of a for which the equation 4cosec2[pi(a+x)]+a2-4a=0 has real roots..... ...
replied2011-08-07 02:46:37
• Show that : tan2 Ï€/7 +tan2 2Ï€/7 +tan2 3Ï€/7 =21 ...
replied2011-08-04 09:11:29
• find the minimum of (sin2x+3sinxcosx+5cos2x) ...
replied2011-08-01 21:46:39
• prove it plz... sin3a-cos3a=(sin2a-cos2a)(1-2sin2acos2a) ...
replied2011-07-24 22:48:10
• help me friends! Find the general solution of following trigonometric equations- 1) solve cos4x + sin4x = 2 cos ( (2x) + (pi/6)) cos ( (2x) - (pi /6)) 2) Solve sin2x + 2tan2x + ((4/ 3 ) tanx) - sinx + (11/12) = 0 3) 2sin (x + ...
replied2011-07-24 22:09:56
• Prove the following identities:- (1-cos2A)/sin2A - sin2A/(1+cos2A) = tanA Is the question correct??? ...
replied2011-07-21 23:21:09
• If A=sin2x +cos4x,then for all real x: a. 3/4 â‰¤Aâ‰¤ 13/16 b. 3/4 â‰¤Aâ‰¤1 c. 13/16 â‰¤Aâ‰¤1 d.1â‰¤Aâ‰¤2 please provide a detailed solution to the above problem. Thank You. ...
replied2011-07-20 22:06:40
• Can anyone tell my mistake i am making in the general solution of following equation; I am getting different answers. Solve - 4sin2x + 3cos 2x = 5 My answer- 4(2sinxcosx) + 3 ( 2cos2x - 1) = 5 â†’ 8 sinx cosx + 6 cos2x = 8 â† ...
replied2011-07-06 03:01:42
• prove ... cot4x(sin5x+sin3x) = cotx(sin5x-sin3x) ...
replied2011-07-04 06:22:46
• hi frnds, I am confused. i am getting two different answers .help me out. Solve; 4sin(2x) + 3 cos (2x) =5 My solution is: 4(2sinx cos x) + 3 (2cos2x - 1) =5 â†’8sinx cosx + 6cos2x = 8 Divide both sides by cos2x â†’8tanx + 6 = ...
• The Product (1 + tan1Â°) (1 + tan2Â°) (1 + tan3Â°) ........ (1 + tan45Â°) equals: a) 221 b) 222 c) 223 d) 224 ...
replied2011-06-28 09:10:42
• If K= sin (pi/18) sin (5pi/18) sin ( 7pi/18) , then numerical value of K is ...
replied2011-06-28 07:56:21
• Calculate; 1) 4cos20Â° - 3 cot20Â° 2) ( 2cos40Â° - cos20Â°)/sin 20Â° ...
replied2011-06-26 02:31:50
• esinx+e-sinx=4 Find the maximum value of x. ...
replied2011-06-25 08:43:43
• Help me friends.I am not able to solve it. If tan( (pi/4) + y/2) = tan3 ( (pi/4) + x/2), prove that sin(y)/ sin(x) = (3 + sin2x)/ (1+ 3sin2x) ...
replied2011-06-23 12:29:41
• *Image* ...
replied2011-06-17 00:07:33
• *Image* ...
replied2011-06-16 23:29:26
• \cot^{-1} \frac{y}{\sqrt{1-x^{2}-y^{2}}}=2\tan^{-1} \sqrt{\frac{3}{4x^{2}}-1}-\tan^{-1} \sqrt{\frac{3}{x^{2}}-4} &\\\\ \text{Q. Express the above as a rational integral equation between x and y.} My attempt went dirty after a ...
replied2011-06-11 11:58:54