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Nana76 [90]
3 years ago
14

Please answer the question in the screen shot right

Mathematics
1 answer:
ss7ja [257]3 years ago
5 0
Its decagon. cause it has 10 corners.

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6 pairs of socks

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After selling one third of his apple crop, a farmer sold the remainder at the same price per bushel for $600. What was the value
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5 0
3 years ago
G)<br>(Sin 5A - Sin 7A - Sin 4A + Sin 8A)÷<br>(Cos 4A - Cos 5A - Cos 8A + Cos 7A)=<br>Cot 6A​
RoseWind [281]

We use a similar strategy as in your previous question. Rewrite:

sin(5<em>x</em>) = sin(6<em>x</em> - <em>x</em>) = sin(6<em>x</em>) cos(<em>x</em>) - cos(6<em>x</em>) sin(<em>x</em>)

sin(7<em>x</em>) = sin(6<em>x</em> + <em>x</em>) = sin(6<em>x</em>) cos(<em>x</em>) + cos(6<em>x</em>) sin(<em>x</em>)

→ sin(5<em>x</em>) - sin(7<em>x</em>) = -2 cos(6<em>x</em>) sin(<em>x</em>)

sin(4<em>x</em>) = sin(6<em>x</em> - 2<em>x</em>) = sin(6<em>x</em>) cos(2<em>x</em>) - cos(6<em>x</em>) sin(2<em>x</em>)

sin(8<em>x</em>) = sin(6<em>x</em> + 2<em>x</em>) = sin(6<em>x</em>) cos(2<em>x</em>) + cos(6<em>x</em>) sin(2<em>x</em>)

→   sin(8<em>x</em>) - sin(4<em>x</em>) = 2 cos(6<em>x</em>) sin(2<em>x</em>)

cos(5<em>x</em>) = cos(6<em>x</em> - <em>x</em>) = cos(6<em>x</em>) cos(<em>x</em>) + sin(6<em>x</em>) sin(<em>x</em>)

cos(7<em>x</em>) = cos(6<em>x</em> + <em>x</em>) = cos(6<em>x</em>) cos(<em>x</em>) - sin(6<em>x</em>) sin(<em>x</em>)

→   cos(7<em>x</em>) - cos(5<em>x</em>) = -2 sin(6<em>x</em>) sin(<em>x</em>)

cos(4<em>x</em>) = cos(6<em>x</em> - 2<em>x</em>) = cos(6<em>x</em>) cos(2<em>x</em>) + sin(6<em>x</em>) sin(2<em>x</em>)

cos(8<em>x</em>) = cos(6<em>x</em> + 2<em>x</em>) = cos(6<em>x</em>) cos(2<em>x</em>) - sin(6<em>x</em>) sin(2<em>x</em>)

→   cos(4<em>x</em>) - cos(8<em>x</em>) = 2 sin(6<em>x</em>) sin(2<em>x</em>)

Then

(sin(5<em>x</em>) - sin(7<em>x</em>) - sin(4<em>x</em>) + sin(8<em>x</em>)) / (cos(4<em>x</em>) - cos(5<em>x</em>) - cos(8<em>x</em>) + cos(7<em>x</em>))

= (2 cos(6<em>x</em>) sin(2<em>x</em>) - 2 cos(6<em>x</em>) sin(<em>x</em>)) / (2 sin(6<em>x</em>) sin(2<em>x</em>) - 2 sin(6<em>x</em>) sin(<em>x</em>))

= (2 cos(6<em>x</em>) (sin(2<em>x</em>) - sin(<em>x</em>))) / (2 sin(6<em>x</em>) (sin(2<em>x</em>) - sin(<em>x</em>)))

= cos(6<em>x</em>) / sin(6<em>x</em>)

= cot(6<em>x</em>)

QED

5 0
3 years ago
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