is quite hard.......and a stupid me cant solve this awnser....
210364
Its actually easy:\n\ncos(a+b) = cos a cos b - sin a sin b\ncos(a-b) = cos a cos b + sin a sin b\n\nso your lhs = cos^2 a cos^2 b - sin^2 a sin^2 b\n=cos^2 a ( 1 - sin^2 b) - ( 1 - cos^2 a) sin^2 b\n=cos^2 a - cos^2 a sin^2 b - sin^2 b + cos^2 a sin^2 b\n=cos^2 a - sin^2 b\n= (cos a - sin b)(cos a + sin b)\n=rhs\n\nHope I am clear here.
365068
and whats the question..its not very clear
35190
r u crazy? i dont know maths
25431
im fine with not being that smart. that question just gave me a headache. im not dumb but im not that smart either
35744
first make sure you have the basic math skills down, then do problems...do problems and then do more problems...lots of practice can make anything easier...unfortunately there is no way to get around this...
225807
oh my god!! this is hard.. hmm,....maybe its that thing that attached to the computer and push your finger into the tiny little boxes with letters...\n\nor is it the thing that make music when you press those long white and black cubes..??\n\n(confused?)
438459
humm.. who knows sorry dude i cant help you out
543428
Difficult ones...dont cheat!...;
174967
Took it last quarter, looked at it like a puzzle.  A puzzle is fun, math is not.  You start with the matrix given in the problem, and have to finish with ending matrix given.  Do what you need to do to get to the last matrix.  The best part, if you mess-up, just do another set.  There are no wrong answers, try doing it like a puzzle, more fun than Soduko.  Good Luck
64725
its easy...much easy more than u can just think,\ntry it..
137671
Dear friend, I think your problem is either understanding or or basic mathematics ( some principles and rules ).\n\n"EVERY THING IS DIFFICULT BEFORE THEY ARE EASY"\n\nFirst understnd the peoblem and then think what are the next. Do everything effectively and efficiently. you ask your teacher once or twice or thrice or.... until you undertstood the problem. Understnding creates east of every thing. good luck...\n\n\n\n\n\nhttp://futureaccountant.com\n\nhttp://schoolingkids.com
285125
It is a major puzzle, no one is quite sure. See the attached article for more details...
321820
that's the hardest question i have faced in my whole life.  naming 1 is hard enough and you have us to give you 3, oh man that is impossible.
630561
i failed to understand the question
520575
this question is very very serious trouble.
286133
I can do it... but let me think a little on it.  Can I take the full 4 months?  :-)\n\nOkay, I think I have a solution... took me about 5 minutes I think:\n\nIf I move the dot from B1 -> B2 and C1 -> C2, then B and C will still have 4 dots, and row four will still have 4 dots, but now row two will have 4 dots.\n\nYou didn't say they couldn't share the same square!!!!\n------------\nI'm back\n\nYou didn't exactly state what a "row" was.  I would have called that a "line" but maybe that's what you meant.\n\nOkay, I have a couple revised solutions.  A "row" is now defined as 4 dots that are colinear (on the same line) but each point must be distinct.  This invalidates my previous answer.\n\nOne solution matches with what has already been stated, which is:\nA4 --> B5  and  D4 --> C5.  This makes two pairs of overlapping lines each with 4 dots.\n\nHowever, my new solution is to take C1 and place it halfway between columns B and C and halfway between rows 2 and 3.\n\nThen you have a line on row 4, a line on column B, and two diagonal lines!!!!\n\nOne dot moved, 4 lines created!!!!\n\nAnd if you *must* move two dots, then just move B1 --> B5 and you still have a valid answer.
522588
Can you please check you haven't made a mistake somewhere? I have just calculated (with 99% certainty) that there are no solutions to those equations with those restrictions.\n\nEdit - OK, I assumed you made exactly one mistake. By removing each possible word and trying to solve it, I discovered that removing 'SIGH' was the only option that gave an answer.\nt 1\nh 8\na 3\nn 7\nk 6\ns 5\ng 9\ni 4\nv 2\nwhere SIGH = 26, not 25. Then THANKSGIVING = 65.\n\nThat was actually a cooler puzzle that the original, assuming you made one mistake :)