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Dovator [93]
2 years ago
15

Solve pls brainliest

Mathematics
1 answer:
enot [183]2 years ago
3 0
36 is 45% of 80
36/80 multiple both nominator and denominator by 100/100.
If using a calculator simply 36 divided by 80 and multiply by 100 giving you 45%
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3 years ago
What is 2 9/10 as a decimal.
ziro4ka [17]
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3 0
3 years ago
Read 2 more answers
Cos(x + y) + cos(x − y) = 2 cos(x) cos(y)
Alex17521 [72]
   
\texttt{We use formula: }~~~  \boxed{\cos(x\pm y) = \cos (x) \cos (y) ~\mp ~\sin (x) \sin (y)}\\\\
\cos(x + y) + \cos(x - y) =\\\\
= \underbrace{\cos (x) \cos (y) -\sin (x) \sin (y)}_{\cos(x + y) } +\underbrace{\cos (x) \cos (y) +\sin (x) \sin (y)}_{\cos(x - y)} =\\\\
=\cos (x) \cos (y)+\cos (x) \cos (y)-\sin (x) \sin (y)+\sin (x) \sin (y)=\\\\
=\cos (x) \cos (y)(1+1) + \sin (x) \sin (y)(-1+1) = \\\\
=2\cos (x) \cos (y) + 0\sin (x) \sin (y) = \boxed{\boxed{2\cos (x) \cos (y)}}



6 0
3 years ago
Read 2 more answers
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