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Ierofanga [76]
3 years ago
12

Help me plz with this I need help

Mathematics
1 answer:
marysya [2.9K]3 years ago
4 0
How are we supposed to help with this what the heck??
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Establish the identity.<br> (2 cos 0-6 sin 0)² + (6 cos 0+2 sin 0)2 = 40
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Rewriting the left-hand side as follows,

(2\cos\theta-6\sin \theta)^2 +(6\cos \theta+2\sin \theta)^2\\\\=4\cos^2 \theta-24\cos \theta \sin \theta+36 \sin^2 \theta+36 \cos^2 \theta+24 \cos \theta \sin \theta+4 \sin^2 \theta\\\\=40\cos^2 \theta+40 \sin^2 \theta\\\\=40(\cos^2 \theta+\sin^2 \theta)\\\\=40

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Ksivusya [100]

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2 years ago
A train traveled 720km in 9h. How far would it travel in 11 hr? How long would it take to go 1120km?
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