3sin^2a - 7cos^2a, если cosa=-4...

sichuckyulia20 @sichuckyulia20

July 2022 1 5 Report

3sin^2a - 7cos^2a, если cosa=-4

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12345Julia12345 $3sin^{2}a-7cos^{2}a$
Добавим и вычтем $3cos ^{2} a$ :
$(3sin^{2}a+3cos^{2}a)-3cos^{2}a-7cos^{2}a=1-10cos^{2}a$
$1-10*(-4)^2=1-10*16=-159$

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