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paolaf9996

paolaf9996

05.06.2021 •

Mathematics

This is a trignometry question

hope u will do for me

i will mark brainliest..:)

This is a trignometry questionhope u will do for me i will mark brainliest..:)

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Ответ:

marcus5266

05.07.2021

Step-by-step explanation:

$\cos^{4} x - \sin^{4} x$

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

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

$= 1 - 2\sin^{2} x$

Note: I replaced all cos^2x terms using the identity

$\cos^{2} x = 1 - \sin^{2} x$

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Ответ:

finnthedino

23.04.2021

B is the correct answer

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