Ответ:
[tex]4[/tex] - не зависит от α
Объяснение:
[tex](\frac{2cos\alpha}{1+sin\alpha}+\frac{2cos\alpha}{1-sin\alpha})\cdot cos\alpha=\\\\(\frac{2cos\alpha(1-sin\alpha)}{(1+sin\alpha)(1-sin\alpha)}+\frac{2cos\alpha(1+sin\alpha)}{(1+sin\alpha)(1-sin\alpha)})\cdot cos\alpha=\\\\\frac{2cos\alpha-2cos\alpha sin\alpha+2cos\alpha+2cos\alpha sin\alpha}{1-sin^2\alpha}\cdot cos\alpha=\\\\\frac{4cos\alpha}{cos^2\alpha}\cdot cos\alpha=4[/tex]
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Answers & Comments
Ответ:
[tex]4[/tex] - не зависит от α
Объяснение:
[tex](\frac{2cos\alpha}{1+sin\alpha}+\frac{2cos\alpha}{1-sin\alpha})\cdot cos\alpha=\\\\(\frac{2cos\alpha(1-sin\alpha)}{(1+sin\alpha)(1-sin\alpha)}+\frac{2cos\alpha(1+sin\alpha)}{(1+sin\alpha)(1-sin\alpha)})\cdot cos\alpha=\\\\\frac{2cos\alpha-2cos\alpha sin\alpha+2cos\alpha+2cos\alpha sin\alpha}{1-sin^2\alpha}\cdot cos\alpha=\\\\\frac{4cos\alpha}{cos^2\alpha}\cdot cos\alpha=4[/tex]