cos...

irisha21 @irisha21

August 2022 1 8 Report

доказать тождество:

1) sin^4-cos^4+2cos^2=1

2) cos/1-sin=1+sin/cos

Answers & Comments

vera1000 1) $(sin^{2} - cos^{2} )( sin^{2} + cos^{2} )+2 cos^{2} =1$
$sin^{2} - cos^{2} +2 cos^{2} =1$
$sin^{2} + cos^{2} =1$
1=1

2) $\frac{cos}{1-sin} = \frac{1+sin}{cos}$
$\frac{ cos^{2} }{cos(1-sin)} = \frac{1- sin^{2} }{cos(1-sin)}$
$\frac{ cos^{2} }{cos(1-sin)} = \frac{ cos^{2} }{cos(1-sin)}$

2 votes Thanks 4

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