1 year ago

Sin a_____=1/2 [sin (a + b) + sin (a - b)]

Mathematics

1 answer:

QveST [7]1 year ago

7 0

Answer:

$\textbf{A.} \cos b$

Step-by-step explanation:

$\dfrac 12 \left[\sin(a+b)+\sin(a-b) \right]\\\\\\=\dfrac 12\left[ 2 \sin a \cos b\right]\\\\\\=\sin a \cos b$

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So... if we take 22.8 to be the 100%, then it dropped to 12.1,
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so... what is 10.7 in percentage, of 22.8?
well
$\bf \begin{array}{ccllll}
amount&\%\\
\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\
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10.7&x
\end{array}\implies \cfrac{22.8}{10.7}=\cfrac{100}{x}$

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