# Recently Active Trignometry Questions

• prove that tan 3x/ tan x never lies in the range3 and 1/3 whenever define! ...
replied2018-02-19 12:58:36
• Find the sum of all x in [0, 2Ï€] which satisfy the equation 3 cot2 x + 8 cot x + 3 = 0 ...
replied2016-09-25 11:52:04
• Proof that (tan5A+tan3A)/(tan5A-tan3A)=4cos4Acos2A ...
replied2016-08-23 22:52:33
• The value of cos-1(cos12) - sin-1(sin12) is ...
replied2016-05-03 11:26:02
• α ≤ sin-1x + tan-1x + cos-1x ≤ β then a) α =0, β = π b) α =0, β = ~~frac{pi }{2} c) α = frac{pi }{2} , β =π d) None of these ...
replied2016-05-03 11:17:17
• If Î¸+Ï†=Î±And tanÎ¸=ktanÏ†Then prove sinÎ±=sin(Î¸-Ï†)(k+1)/(k-1) ...
0·0· #Trignometry
• prove : 1/4(a^2cotA +b^2cotB +c^2cotC) = S ...
0·0· #Trignometry
• If Tan A/2 = (Tan B/2)3 and Tan B = 2 Tan C then find (A + B)\C. ...
• Find all values of x which satisfies this equation, sin5x+cos3x=1 ...
replied2014-07-31 10:47:22
• If sin Î± + sin Î² = a and cos Î± + cos Î² = b,then prove that sin(Î± + Î²) = (2ab/a2 + b2) ...
replied2014-07-22 03:14:35
• if Î±,Î² are two different values of Î¸ lying between 0 and 2Î which satisfy the equation 6 cos Î¸ + 8 sin Î¸ = 9,then find the value of sin(Î± + Î²). ...
replied2014-07-22 03:00:29
• If angle Î¸ is divided into two parts such that the tangent of one part is Î» times the tangent of the other, and Î± is their difference,show that sinÎ¸ = (Î»+1/Î»-1)sinÎ± ...
replied2014-07-17 05:45:45
• If cosÎ¸=ncos(Î¸+2Î±)then show that (n+1)tan(Î¸+Î±)=(n-1)cotÎ± ...
replied2014-06-23 03:07:35
• *Image* ...
replied2014-06-11 22:08:03
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replied2014-06-11 22:00:23
• Prove that : CotA + Cot(60+a) - Cot(60 -a) = 3Cot3A ...
• Prove that: TanA + Tan(60+a) - Tan(60 -a) = 3Tan3A ...
• cos2x + cos22x + cos23x + cos24x=2...find the general value of x ...
replied2014-06-06 23:05:26
• tan-1(tan 7) = a:7-2Î b:2Î -7 c:7 Please give the reason behind the answer. ...
replied2014-06-04 03:44:15
• the positive values of a for which the equation [x+a]=sin(Ï€x/2) will have no solution is,where [.] denotes greatest integer function- a) (0,1); b)(1,2);c) (0,2);d) NOT. ...
• 1)If sin-1x + tan -1x = , then 2x2 + 1= 2)2 sin -1x = cos-1 (1 -2x2) is true for a. -1<=x<=1 b.-1<=x<=0 c.0<=x<=1 d.None of these 3)7)If sin-1x+sin-1y=2pi/3, cos-1xâ€“cos-1y=pi/3, the number of ordered pairs ...
replied2014-06-01 19:42:47
• 1. *Image* 2. *Image* 3. *Image* ...
replied2014-05-21 03:29:23
• 1. *Image* 2. *Image* 3. *Image* 4. *Image* 5. *Image* 6. *Image* ...
replied2014-05-14 09:20:21
• If cos(Î±-Î²)+cos(Î²-Î³)+cos(Î³-Î±)= -3/2 , then p.t. â†’ cosÎ± +cosÎ² +cosÎ³ =sinÎ± +sinÎ² +sinÎ³ =0 . ...
replied2014-04-18 06:49:21
• If tan(inverse)(x+2/x)-tan(inverse)4/x-tan(inverse)(x-2/x)=0 then x=............ y=........... (M.L.Khanna Page 464 Problem No.37a) ...
replied2014-04-17 10:45:20
• Write the following function in the simplest form :- tan_1âˆš 1-x/1+x ...
replied2014-04-10 23:21:39
• simplify plz:- tan-1( (3a2x-x3)/a(a2-3x2) ) ...
replied2014-03-26 23:01:29
• Prove that sin2Î¸=(x+y)2/4xy possible for real values of x and y only when x is equal to y. x not equal to 0. ...
replied2014-03-11 03:36:56
• Prove that tan 8Î¸ -tan 6Î¸- tan 2Î¸ = tan 8Î¸ tan 6Î¸tan 2Î¸ ...
replied2014-03-10 22:39:34