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វិញ្ញាសាទី ១ ( គណិតវៀតណាម ) October 17, 2008

Posted by math4you in គណិតវិទ្យាវៀតណាម (Vietnam Math).
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1.)   4(cos4x + sin4x) = 3 + cos4x

2.)   8(cos6x + sin6x) = 5 + 3cos4x

3.)   16cos3xsin2x = 2cosx – cos3x – cos5x

4.)   F(x) = sinx / ( x4 – 3x2 + 2 )

5.)   E = 3sin4x + 3cos4x – 2cos6x – 2cos6x

6.)   1 + sin2x / cos4x = 1 + tg2x + tg4x

7.)   ( Sin2x – tg2x ) / ( cos2x – cotg2x ) = tg6x

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