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i will just tell u how u can do...try and see...

first of all expand cos(a+b)=cosa cosb - sina sin b

now one of the terms cums in as 2cos^2a cos^2b..write it as cos^2a cos^2b + cos^2a cos^2b...now combine this wid each one of the terms cos^2a...try it its easy

aint there any constraints on value of a...and are u sure ans in root of 2

niki has dun a wondeful job....please use the equation editor to write the ques clearly so dat efforts of ppl like sre dont go waste...have a nice tym..!!

feynmann has dun a "feynmann" like job..gud...!!!

yaar simply take 1st two terms and apply formula..similarly next two terms...go on...a sine term will cum out to be common..tht will help u..see nw

now at first u chose 1st candy...u have 8 choices in the form of 8 brands...so u have 8 ways to select first candy..now when chosing 2nd candy u again have 8 choices as repetiton allowd...so in all u have 8 to the power 6 ways

lambda=5890 angstrom

l=0.10

d=0.50

simply use the formula (lambda)(l)/(d)....see u gotts understand this becoz this ques is sure in jee..and its so simple..just see its picture in book...its like u r sending a ligth of sum wavelength thru a slit so as to convert it to monochromatic light...it falls on a scree where image is formed...l is distnce of screen from the slit..and d is place on screen where we wish tomeasure

avdesh has given rite reasoning...

whts an ID curve??please write the full form

well tarin bansal is absolutely correctly...and Det means determinant....as u may have dun in matrices....

hello..well coaching is really not essential to succeed..blv me...and it is nt at all late..u have still abt one and half year left...self study is enf if it is directed..all i wud suggest is get correspondence course of any good coaching insti fitjee vidyamandir brilliant which ever is convenient to u..study those packages and ncert books thoroughly wid proper revision schedule(very imp)..and once in a month u can go out and give xam to see if u r goin rite...

hey pops...well i appreciate ur eagerness to noe new things but it is completely outa syllabus...i can tell u but i have studied here in college and it wud be tuf to xplain u ..so just be cool like ur name pops..hehe

hey hi..well yaar force is always in direction of acceleration or rather acceleration is in direction of force and as for work W=F.S..because of this dot product W has no direction ..it simply follows distance

normal incident rays mean when incoming rays hit at alost 0 angle with normal..this is said in ques because if u read the lenses carefully then in order to use the formula the assumption is tht the rays are very close and hit normally

see truly speakin these ques are nt in course and they never form part of whole ques...we can do one thing..just tell me any ques related to it and then we can do it and tht will be better for u