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Mathematics: Post your doubts here!
sin3xsinx = 1/2(cos2x)- 1/2(cos4x) so u integrate 1/2(cos2x)- 1/2(cos4x) ,u wil get : [1/4(sin2x) - 1/8sin4x] now put in the limits for x.. u wil get ur answer (y) -
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Mathematics: Post your doubts here!
cosec2@ = sec@ + cot @ so, 1/sin2@ =(1/cos@) + (cos@/sin@) 1/sin2@ = (sin@ + cos^2@)/(cos@sin@) 1/sin2@ = [sin@ +(1- sin^2@)]/ (cos@sin@) 1/sin2@ = (sin@+1- sin^2@)/(cos@sin@) i am multiplying right hand side with (2/2) so, 1/sin2@ = 2(sin@+1-sin^2@)/2sin@cos@ 1/sin2@ = 2(sin@+1-sin^2@) /... -
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Chemistry: Post your doubts here!
knowledge :p but the uses or mobile and stationary phases of different chromatography techniques could be asked! -
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GOOD LUCK ;D !!!
best of luck to all chem p4 and maths p3 peeps :) (y) !! may the odds be ever in our favour :p ! MAY ALLAH (SWT) SHOWER HIS BLESSINGS ON US! -
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Chemistry: Post your doubts here!
wel its wriiten in chemistry book that in aqueous solutions Fe3+ is yellow.. we have to take the acidic and alakine conditions into consideration because they have specified it in the question, if u donot take the conditions into consideration u wil get stuck in the question because there are... -
Chemistry: Post your doubts here!
in 4b (i) we have FeSO4 which has a pale green colour due to Fe^2+ ions... when we start adding KMnO4 (oxidising agent) to FeSO4 the pale green colur starts fading away,the solution turns very pale yellow (almost colourless) because the Fe2+ ions are getting oxidised into Fe3+.. and Fe3+ are... -
Chemistry: Post your doubts here!
NMR is used to obtain the information about the number of hydrogen atoms and their chemical environment (to predict the structure of organic molecules ). MASS SPECTROMETER is used to predict the relative atomic mass of the element,the different isotopes of the element and the relative abundance... -
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Mathematics: Post your doubts here!
i am taking R.H.S: (secx)^2 = 1/(cosx)^2 so, [1/(cosx)^2] / tanx.. [1/(cosx)^2] x (1/tanx) [1/(cosx)^2] x (cosx/sinx) it becomes : (cosx)/[(cosx)^2 sinx] simplify u get : 1/cosx sinx -
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Mathematics: Post your doubts here!
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s11_qp_33.pdf can anybody help me with qs 7 (iii) ? -
Chemistry: Post your doubts here!
um in c (i) we calculated [Ag+] = 7.1x10^-7 now they are asking us to calculate [NH3] that wil give us this value of [Ag+].. and they have given ys the concentration on silver nitrate... here we have to assume that due to ligand substitution silver nitrate got converted into the complex... -
Duaa's to Help in Examinations =)
on the day of exam / interview recite the following dua 99 times.. " YA RABBAL ALAMEEN INNI US ALUKA KHAIRA HAZAL YAUM WA NASRIKA,WA NOORIKA, WA BARAKATIKA" translation : " O LORD OF THE WORLDS, VERILY I ASK YOU FOR GOOD ON THIS DAY, AND YOUR HELP, AND YOUR LIGHT ,AND YOUR BLESSING " i hav not... -
Duaa's to Help in Examinations =)
knowitall10 <3.. jazakALLAH! i like you even more now... may ALLAH bless you!