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jek_recluse [69]
3 years ago
8

What does this symbol '' £ '' mean in math, and i know its not the pound symbol.

Mathematics
1 answer:
Basile [38]3 years ago
5 0
Could just be used as a variable.
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5.1

Step-by-step explanation:

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If sinx+sin^2x=1 then what is the value of cos^12x+3cos^10x+3cos^8x+cos^6x
mr_godi [17]
\sin x+\sin^2x=1\implies\sin x=1-\sin^2x=\cos^2x

\cos^{12}x+3\cos^{10}x+3\cos^8x+\cos^6x=\sin^6x+3\sin^5x+3\sin^4x+\sin^3x
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Let y=\sin x. Then

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\begin{cases}y=-\varphi\\y=\varphi-1\end{cases}\implies\begin{cases}\sin x=-\varphi\\\sin x=\varphi-1\end{cases}

Since |\sin x|\le1 for all real x, we can omit the first equation, leaving us with

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\cos^{12}x+3\cos^{10}x+3\cos^8x+\cos^6x=\sin^3x(\sin x+1)^3
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7 0
3 years ago
Need help is confused​
Afina-wow [57]

Answer: a = 3.6

<u>Step-by-step explanation:</u>

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3 0
4 years ago
The figure shows a carpeted room. How many square feet of the room are carpeted?
Lisa [10]
I think the answer is 126.
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