Which expression is NOT equivalent to 8 . -54?

Mathematics

2 answers:

ivanzaharov [21]3 years ago

8 0

Answer:

i need help with this too

Step-by-step explanation:

lmk if you get the answer

topjm [15]3 years ago

3 0

Answer:

1st & 4th

Step-by-step explanation:

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PLEASE HELP!!

erik [133]

$2.=c.\\\\2\sin4x\cos4x=2\sin(2\cdot4x)=2\sin8x\\\\Used:\\\sin2\alpha=2\sin\alpha\cos\alpha$

$1.=b.\\\\\csc x-\sin x=\dfrac{1}{\sin x}-\dfrac{\sin^2x}{\sin x}=\dfrac{1-\sin^2x}{\sin x}=\dfrac{\cos^2x}{\sin x}\\\\=\dfrac{\cos x\cos x}{\sin x}=\cos x\cdot\dfrac{\cos x}{\sin x}=\cos x\cot x\\\\Used:\\\csc x=\dfrac{1}{\sin x}\\\\\sin^2x+\cos^2x=1\to\cos^2x=1-\sin^2x\\\\\cot x=\dfrac{\cos x}{\sin x}$

$3.=a.\\\\\dfrac{\sin x-1}{\sin x+1}=\dfrac{\sin x-1}{\sin x+1}\cdot\dfrac{\sin x+1}{\sin x+1}=\dfrac{\sin^2x-1^2}{(\sin x+1)^2}=\dfrac{\sin^2x-1}{(\sin x+1)^2}\\\\=\dfrac{-(1-\sin^2x)}{(\sin x+1)^2}=\dfrac{-\cos^2x}{(\sin x+1)^2}\\\\Used:\\(a-b)(a+b)=a^2-b^2\\\\\sin^2x+\cos^2x=1\to \cos^2x=1-\sin^2x$

8 0

3 years ago

How much will it cost to ride if the cab travels 13.5 miles?

MrMuchimi

Please provide more information. This question is not able to be answered with the information provided. Try giving the full problem!

6 0

3 years ago

Read 2 more answers

you have a large tank filled with 175 gallons of water the tank springs a leak and water is pouring out at a rate of 5 gallons p

Len [333]

175/5= 35

The answer is 35 minutes.

Hope this helps!

3 0