4 years ago

Solve the equation for y.

Mathematics

1 answer:

zimovet [89]4 years ago

6 0

Either A or D but D i think
I got y = 8x/9 - 11/9

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riadik2000 [5.3K]

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4 years ago

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Simplify <img src="https://tex.z-dn.net/?f=sin%20x%5E%7B2%7D%20%28x%29cos%20x%5E%7B2%7D%20%28x%29-cos%20x%5E%7B2%7D%20%28x%29" i

zhenek [66]

$sin^2(x)cos^2(x)-cos^2(x)\\\\=sin^2(x)\cdot cos^2(x)-1\cdot cos^2(x)\\\\=cos^2(x)\cdot(sin^2(x)-1)\\\\=cos^2(x)\cdot[-(1-sin^2(x)]^{(*)}\\\\=cos^2(x)\cdot[-cos^2(x)]^{(*)}\\\\\boxed{=-cos^4(x)}\\------------------\\(*)\ used:\\\\sin^2(x)+cos^2(x)=1\to cos^2(x)=1-sin^2(x)$