rawrzxz
05-21-2012, 16:49
Задача по математика от 10 клас:
http://www.math10.com/cgi-bin/mimetex.cgi?1%29cotg%20%20\frac{\alpha}{%202}%20%2 0=%20-%20\frac{4}{3%20}%20%20;%20%20\alpha%20%20\in%20%2 0%28270^\circ%20;360^\circ%20%29%3Cbr%20/%3E%3Cbr%20/%3EIzchisli%20:%20A=sin\alpha%20+cos\alpha%20..... ......2%29%3Cbr%20/%3E%3Cbr%20/%3E%3Cbr%20/%3EOprosti%20\frac{sin2\alpha%20}{%201+cos2\alpha% 20}%20.\frac{cos\alpha%20}{1+cos\alpha%20%20}%20=% 20?
http://www.math10.com/cgi-bin/mimetex.cgi?1%29cotg%20%20\frac{\alpha}{%202}%20%2 0=%20-%20\frac{4}{3%20}%20%20;%20%20\alpha%20%20\in%20%2 0%28270^\circ%20;360^\circ%20%29%3Cbr%20/%3E%3Cbr%20/%3EIzchisli%20:%20A=sin\alpha%20+cos\alpha%20..... ......2%29%3Cbr%20/%3E%3Cbr%20/%3E%3Cbr%20/%3EOprosti%20\frac{sin2\alpha%20}{%201+cos2\alpha% 20}%20.\frac{cos\alpha%20}{1+cos\alpha%20%20}%20=% 20?