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klemol [59]
2 years ago
11

What is faster drive a car that goes 40 k per hour or a car that goes 15 meters per second

Mathematics
2 answers:
BigorU [14]2 years ago
8 0

Answer:

get smart stupid

Step-by-step explanation:

krek1111 [17]2 years ago
8 0

Answer:

40k per hour is faster

mark me as branliest plz

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Use trigonometric identities to solve each equation within the given domain.
KengaRu [80]

It looks like the equation is

-sin²(<em>x</em>) = cos(2<em>x</em>)

Recall the half-angle identity for sine:

sin²(<em>x</em>) = (1 - cos(2<em>x</em>))/2

Then the equation can be written as

-(1 - cos(2<em>x</em>))/2 = cos(2<em>x</em>)

Solve for cos(2<em>x</em>):

-1/2 + 1/2 cos(2<em>x</em>) = cos(2<em>x</em>)

-1/2 = 1/2 cos(2<em>x</em>)

cos(2<em>x</em>) = -1

On the unit circle, cos(<em>y</em>) = -1 when <em>y</em> = arccos(-1) = <em>π</em>. Since cosine has a period of 2<em>π</em>, more generally we have cos(<em>y</em>) = -1 for <em>y</em> = <em>π</em> + 2<em>nπ</em> where <em>n</em> is any integer. Then

2<em>x</em> = <em>π</em> + 2<em>nπ</em>

<em>x</em> = <em>π</em>/2 + <em>nπ</em>

<em />

In the interval [-<em>π</em>, <em>π</em>], you get two solutions <em>x</em> = -<em>π</em>/2 and <em>x</em> = <em>π</em>/2.

8 0
2 years ago
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