2 years ago

1.9996 by 2 significant numbers

Mathematics

1 answer:

Svetradugi [14.3K]2 years ago

8 0

1.9 or rounding with 2.0

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<img src="https://tex.z-dn.net/?f=%28%20%5Csin%5E%7B2%7D%20%28%20%5Cfrac%7B%5Cpi%7D%7B%204%20%7D%20%20-%20%20%5Calpha%20%29%20%2

guapka [62]

Step-by-step explanation:

$\sin^2 (\frac{\pi}{4} - \alpha) = \frac{1}{2}(1 - \sin 2\alpha)$

Use the identity

$\sin^2 \theta = \dfrac{1 - \cos 2\theta}{2}$

on the left side.

$\dfrac{1 - \cos [2(\frac{\pi}{4} - \alpha)]}{2} = \frac{1}{2}(1 - \sin 2\alpha)$

$\dfrac{1 - \cos (\frac{\pi}{2} - 2\alpha)}{2} = \frac{1}{2}(1 - \sin 2\alpha)$

Now use the identity

$\sin \theta = \cos(\frac{\pi}{2} - \theta)$

on the left side.

$\dfrac{1 - \sin 2\alpha}{2} = \frac{1}{2}(1 - \sin 2\alpha)$

$\frac{1}{2}(1 - \sin 2\alpha) = \frac{1}{2}(1 - \sin 2\alpha)$

4 0

2 years ago

In a lab experiment, 50 bacteria are placed in a petri dish. The conditions are such that the number of bacteria is able to doub

timurjin [86]

Divide 50 and 20 and you get 2.5 then multiply that with 8 and you’ll get 20
THE ANSWER IS 20

8 0

2 years ago

Read 2 more answers

Csc0sin20-sec0=cos20sec0

Mkey [24]

Answer:0

Step-by-step explanation:

(0)0.342-0=0.9397(0)

0=0

sin 20= 0.342

cos 20=0.9397

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2 years ago

The equation y = 0.002x - 0.30 can be used to determine the approximate cost, y in dollars, of producing x items. How many items

ArbitrLikvidat [17]

Answer:

193650

Step-by-step explanation:

Since the cost must be no more than 387$, you can substitute that number instead of y to get 387 = 0.002x - 0.30. you can add 0.30 to both sides to get 387.3 = 0.002x

Then you can divide both sides by 0.002 to get 387.3/0.002 = 193650

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2 years ago

Toys r us is having a 38% off sale on all of their backpacks. If a backpack normally costs 22.00, how much will it be on sale?

Ad libitum [116K]

The answer is 1668.819191

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2 years ago