Упростить выражение: 1-tg15/1+tg75. Created by 9Lucky. algebra-ru

1+tg75...

October 2021 1 37 Report

Упростить выражение: 1-tg15/1+tg75

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yellok $\frac{1-tg15}{1+tg75} = \frac{1-tg15}{1+tg(90-15)}= \frac{1-tg15}{1-ctg15} = \frac{1-tg15}{1-\frac{1}{tg15} } = \frac{tg15(1-tg15)}{tg15-1} =$ $= -\frac{tg15(1-tg15)}{1-tg15} =-tg15$

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