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yes it shud be cos^2a+cos^4a...........

see class 10th R D Sharma.

simplest trick............
write the problem in equation form...

n/2[2a+(n-1)d]/n/2[2A+(n-1)D] = 7n+1/4n+27....

now everywhere replace n by 2m-1....and u'll get the answer.......

14m-6/8m+23

vidyamandir TS is really the best............i give it.......and i know it!

thx a lot

plz tell me........which book shud i refer for physics.........i went through both HC Verma and Halliday Resnick....and i found the latter interesting.....but everyone says H C verma is better....PLUS halliday resnick is by a foreign author and is not meant for jee.....besides in my coaching ,they tell us do our modules only and do not refer any other book besides NCERT...shud i go by their advice?....... i'm confused!....plz help

wich points of discontinuity?.......in phy?

u're wierd,,,y dont u search it urself rather than asking for it???
here take this is d link,,http://jee.iitr.ernet.in/physics.html

click "syllabus" for maths and chem syllabus too!

the units r...
a=LT*..(*=-2)
b=Lraised to power -1Traised to power2
c=T

itz simple.....just apply d second eqn of motion wid proper signs...and u'll get d answer .itz 58.8 metres....

s=ut +1/2atsq
s=19.6(6)+(-4.9)36
=-58.8 metres ,ie,58.8 m in downward direction

Use permutations..............P(n,2)=n!/(n-2)!=n(n-1)

itz simple use permutation.............P(20,2)=20!/18! =380

yes pH of milk will definitely change as it turns to curd...........due to lactic acid formation,,,its pH decreses

as far as i know...........mass is d quantity of matter contained in a body,,,,,,,,,,,it remains d same everywhere..........whereas weight is d force by which a body is attracted towards d centre of d earth..........roughly.d gravitational pull.........it depends upon "g".......its different at d poles and d equator....mass can never be be changed ,,,whereas weight keeps on changing depending upon d place where u r weighing....i hope i made my point clear