Вычислить: cos^4 15 – sin^4 15 (15 градусы). Created by 4792. algebra-ru

Вычислить: cos^4 15 – sin^4 15 (15 градусы)...

August 2022 1 12 Report

Вычислить: cos^4 15 – sin^4 15 (15 градусы)

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emerald0101 $cos^4 15^ \circ - sin^4 15^ \circ=(cos^2 15^ \circ + sin^2 15^ \circ)(cos^2 15^ \circ - sin^2 15^ \circ)=$
$=cos30^ \circ= \frac{ \sqrt{3}}{2};$

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skilki znadobitsya zerna abi zabezpechiti pririst lisic na zvirofermi na 3kg

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