Recently Active Trignometry Questions

• Prove it: sin-1(1-x) - 2sin-1x = pi/2 ...
replied2009-01-09 04:48:55
• A triange has sides a,b,c and altitudes opp. to these sides h1,h2,h3 resp. The max. value of a2/h12+b2/h22+c2/h32 = ? ...
replied2008-12-27 01:06:46
• A vertical pole consists of two portions,the lower being 1/3rd of the whole.If the upper portion subtends an angle arctan(1/2) at a point in a horizontal plane through the foot of the plane and distance 40ft from it,then the ...
replied2008-12-20 11:57:27
• If x,y,z are respectively sines and p,q,r are respectively the cosines of angles Î±,Î²,Î³ which are in A.P with common difference 2pi/3 ,then 1)x+y+z=? 2)p+q+r=? 3)xy+zx+yz=? ...
replied2008-12-14 20:43:08
• prove tan a + tan 2a + tan 3a = tan a . tan 2a . tan 3a my friend gave me from school.. i cant get anything to work on.. this is so tough :( ...
replied2008-12-14 20:30:00
• try to prove the following inequality given that a,b,c are positive reals Cyclic[(a^2) / {b(a + 2b)}] >= 1 a harddddddddddddddddd problem not at all easy unless u guys know Cauchy Schwarz inequality ...
replied2008-12-11 23:24:47
• 1)Tan-1{x/ a2-x2 } convert 2 simplest form. 2)sin-1{(sin x +cos x)/ 2 } ;-Î /4<x<Î /4 3)if a>b>>c>0,prove that cot-1(ab+1/a-b) + cot-1(bc+1/b-c) + cot-1(ca+1/c-a)= Î ...
replied2008-12-11 06:58:10
• if in Î”ABC, A=1200, b-c = 3 3 & area of Î”ABC = 9 3 /2, a,b,c are sides of Î”ABC. then a = ??.. ...
replied2008-12-08 09:31:17
• try to Prove Cosec (180/7) = Cosec(360/7) + Cosec(540/7) (Not very easy... but then not very tough either) ...
replied2008-12-08 09:19:09
• sin(inverse) of log(x) + cos(inverse) of log(x)= ??????? be sure its a tricky que.. A pie/2 B pie C 2pie D cant be predicted ...
replied2008-12-08 06:11:25
• if in a triangle ABC ,the line joinning circumcentre & incentre is parallel to BC then cosB + cosC = ???...(numerical constant)..... ...
replied2008-12-04 19:38:23
• in Î”ABC (a-b)(s-c) = (b-c)(s-a), then r1,r2,r3 are in (a) AP (b) GP (c) HP (d) none ...
replied2008-12-04 10:58:36
• Consider the set of points (x,y) in the plane which satisfied x2+y2<=100 and sin(x+y)>=0. solve the following ques. 1.) the region given by sin(x+y)>=o will be a) angular region between two concentric ci ...
replied2008-12-02 08:52:59
• What is the value of cot 142.5 ...
replied2008-12-01 21:29:35
• eliminate Î¸ and Ï† if sinÎ¸+sinÏ†=a , cosÎ¸+cosÏ†=b and tan(Î¸/2)tan(Ï†/2)=c the way i tried to solve this ques...has made the solution complex... ...
replied2008-12-01 07:28:05
• Find the number of solutions of sin2x=cos3x in o to 2pi ...
replied2008-11-21 19:45:30
• how do we solve the summation of series problems liek sina + sin 2a + sin 3a ... + sin na ...
replied2008-11-21 06:04:58
• no of solutions of the equation: sin2x + sin22x - sin23x - sin24x=0 lying in the inteval (0, pi/2]. a)4 b)2 c)3 d)5 (one answer correct.. three marks question...)... so hope there has to be some trick to solve this one... ...
replied2008-11-19 20:17:45
• f(Ï‰) = (ksin Ï‰ + 2 cos Ï‰)/(sin Ï‰+ cos Ï‰) increasing for all values of Ï‰, then find the range of k. ...
replied2008-11-16 08:19:10
• If in a trianglye ABC, C>3pi/2, then fine the interval in the which the value of (1+tanA)(1+tanB). But how can any angle in a triangle be greater than 3pi/2 ???????? ...
replied2008-11-16 08:14:45
• If A=320Â° then 2sin(A/2) = ? a)âˆš1+sinA -âˆš1-sinA B) âˆš1+sinA +âˆš1-sinA C)-âˆš1+sinA -âˆš1-sinA d)âˆš1+sinA+âˆš1-sinA ...
replied2008-11-16 07:37:18
• If atanÎ¸+bcot2Î¸=c acotÎ¸-btan2Î¸=c,Eliminate Î¸ ...
replied2008-11-14 00:50:41
• If Î¸ and Î± are two real numbers such that ( cos4 Î¸/cos2 Î±) + (sin4 Î¸/sin2Î±) = 1 then prove that: - (cos2n+2 Î¸/cos2nÎ±) + (sin2n+2Î¸/sin2nÎ±) = 1 for integral values of n. ...
replied2008-11-12 20:19:56
• exact value of cos 20Â° + 2 sin2 55Â° - 2 sin65Â°. ...
replied2008-11-10 20:37:16
• 1. find the value of cos 6Â° + sin 24Â° 2. fine the value of cos2 3Ï€/5 + cos2 4Ï€/5 ...
replied2008-11-10 20:26:34
• find the general solution of sin2 4x + cos2x = 2 sin4x. cos4x. ...
replied2008-11-10 20:21:58
• if A>0, B>0, and A+B = pi/3, then what is the maximum value of tanA.tanB ?? ...
replied2008-11-08 21:21:10
• If 3 sinx +4 cos ax = 7 has atleast one solution, then 'a' has to be necessarily a : - 1. odd integer 2. even integer 3. rational number 4. irrational number ...
replied2008-11-08 20:35:15
• Prove Sin(a+b)=sin(a)cos(b)+cos(a)sin(b) ...
replied2008-11-07 04:29:16
• sin10x+cos10x=(29/16)cos4(2x) Solve for x ...
replied2008-11-03 03:41:01