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Lisa [10]
3 years ago
9

Help me plz!:) Help :p

Mathematics
1 answer:
Tema [17]3 years ago
4 0

Answer:

a) 2 x 10^3

b) 5 x 10^-6

Step-by-step explanation:

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Find the exact value of the expression. Write the answer as a single fraction. Do not use a calculator.
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Use:\\sin(x+y)=sinxcosy+sinycosx\\\\tan(-x)=-tanx\\tan(k\pi+x)=tanx\\\\cos(-x)=cosx\\cos(2k\pi+x)=cosx\\cos(x+y)=cosxcosy-sinxsiny


sin\frac{3\pi}{2}=sin(\pi+\frac{\pi}{2})=sin\pi cos\frac{\pi}{2}+sin\frac{\pi}{2} cos\pi=0\cdot0+1\cdot(-1)=-1\\\\tan\left(-\frac{23\pi}{4}\right)=-tan\frac{23\pi}{4}=-tan\left[6\pi+\left(-\frac{1}{4}\pi\right)\right]=-tan\left(-\frac{1}{4}\pi\right)=tan\frac{\pi}{4}=1

cos\left(-\frac{10\pi}{3}\right)=cos\frac{10\pi}{3}=cos\left(2\pi+1\frac{1}{3}\pi\right)=cos\left(1\frac{1}{3}\pi\right)=cos\left(\pi+\frac{\pi}{3}\right)\\=cos\pi cos\frac{\pi}{3}-sin\pi sin\frac{\pi}{3}=-1\cdot\frac{1}{2}-0\cdot\frac{\sqrt3}{2}=-\frac{1}{2}\\\\sin\frac{3\pi}{2}tan\left(-\frac{23\pi}{4}\right)-cos\left(-\frac{10\pi}{3}\right)=-1\cdot1-\left(-\frac{1}{2}\right)=-1+\frac{1}{2}=-\frac{1}{2}
6 0
3 years ago
Please helpppppppppp
NNADVOKAT [17]

Answer:

x=20 y=34

Step-by-step explanation:

x+14=2x-6

x=20

(20)+14=y

y=34

6 0
3 years ago
What is 9.27 as a fraction
Dominik [7]
It is 927/100 because the tenths is always over 100
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4 years ago
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Can someone help with this please
crimeas [40]

Answer:

3^2

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\frac{3^8*\:3^4}{3^2*\:3^8}

Apply Exponent rule: a^b\cdot \:a^c=a^{b+c}

\frac{3^{12}}{3^8* \:3^2}

\frac{3^{12}}{3^{10}}

Apply exponent rule: \frac{x^a}{x^b}=x^{a-b}

3^{12-10}=3^2

5 0
4 years ago
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Properties of real number?
rosijanka [135]

Answer:

In mathematics, a real number is a value of a continuous quantity that can represent a distance along a line

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3 years ago
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