1 year ago

What is the identity of cos 2 θ

1 answer:

7 0

Using the cosine double-angle identity. The cosine double angle formula tells us that cos(2θ) is always equal to cos²θ-sin²θ.

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In still water, a boat averages 12 miles per hour. It takes the same amount of time to travel 14 miles downstream, with the curr

anyanavicka [17]

T is equal in both situations ... d = r X t so d/r = t
c is rate of waters current

$\frac{14}{12+c} = \frac{7}{12-c}$
14(12 - c) = 7(12 + c)
2(12 - c) = 12 + c
24 - 2c = 12 + c
12 = 3c
4 = c The rate of the waters current is 4 miles per hour.

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3 years ago

Which solutions is the correct one?

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Answer:

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2 years ago

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A circular city park has a garden with a sidewalk directly through the middle that is 45 feet long. Each bag of grass seed will

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Answer:3.2 Bags

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3 years ago

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What is the minimum value of the quadratic function?

vesna_86 [32]

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-5

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2 years ago

Find the distance between the points 3,7 and 15, 12 on the coordinate plane?

lana [24]

$\text{Distance } = \sqrt{ (x_2 -x_1)^2 + (y_2 - y_1)^2}$

$\sqrt{ \left( 15 - 3\right)^2 + \left( 12 - 7\right)^2}\\\\\sqrt{\left( 12\right)^2 + \left( 5\right)^2}\\\\\sqrt{ 144 + 25 }\\\\\\ \sqrt{ 169 } = \boxed{\bf{ 13}}$

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2 years ago