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#3 Re: Exercises » TRy to get a perfect square » 2007-05-22 20:51:28

yup,.. neat...
also a good idea , another way of learning...
also great.
How about eliminating and substitute?
some of the equations?

#4 Re: Help Me ! » trigonometry » 2007-05-22 20:32:28

George,Y wrote:

4sin20sin20sin40tan30
4sin20cos20cos40

=4sin20sin20sin40tan30
               sin80

So  4sin20sin20sin40tan30 should be sin10

is this correct?

#5 Exercises » TRy to get a perfect square » 2007-05-22 15:48:08

lancemaria
Replies: 2

Hello Everyone,
To get the product of two the same number.
Example:
         12 x 12 = 144
To get et easily,
Multiply the first number (1x1) = 1
And then the last digit (2x2) = 4
And then to get the mid number simply like this (1x2) + (1x2) = 4
you will get an answer of 144...

try this one 26x26 ? =

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