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ok thanx

but shouldn't the answer be positive icot@/2 ........ for w=cos@+isin@

hahahaha its not really cheating :) no one posted the working outs its the workin out that counts right...

thanx

what i got is icot @ from using the half angles.

can some one help me out let w= cos8+isin8 and z=w+1/w-1 show that z=-i cot8 8 = theta Thanx

Im currently doin physical journey and would like to know if any good supplementary material is recommended. thanx

its ok. :)

yeah but don't u have to derivative things inside the bracket. Chain rule times it by the index ,minus one from the index and multiply the derivative of the things in the bracket. correct me if im wrong.........THANX

shouldn't it be: dy/dx=2x+1/2(4-x)^-1/2(-1) times it by negative one so it becomes dy/dx=2x-1/(2sqrt(4-x))

thank u very much

need help on the following questions 1. mr and mrs jones and 6 guests sit around the dinner table. in how many ways can they be arranged if the two hosts are separated? 2. in how many ways can a committee of 3 women and 4 men be chosen from 8 women and 7 men if two particular women refuse...

thanx

Find the limiting sum of 1-1/3+1/9-1/27+......... this is what i did. a=1 r=1/3 s=1/(1-1/3) =3/2 but the answer is 3/4

thanx

can someone explain what is michelson morley's experiment is because i don't really get what it is used for and what we really have to know about it thanx :)

ok thanx

but isn't the person in the train experience a shorten in the lenght of time so therefore he would see the front door open then the back door. correct me if im wrong thanx

does inertial frame of reference the same as different point of view

explain what does it mean. THANX:)