3 years ago

My new speaker costs $154.00, but I also had to

Mathematics

2 answers:

const2013 [10]3 years ago

6 0

Answer:

$247.94

Step-by-step explanation:

Inessa05 [86]3 years ago

4 0

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3 years ago

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NemiM [27]

since they both end with 5 divide each number by 5

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3 years ago

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3 years ago

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kiruha [24]

Answer:

See solution below

Step-by-step explanation:

Given the expression

$\frac{cos(x+30)-sin(x+60)}{sin(x)cos(x)} \\$

Recall that

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cos(x+30 ) = sin (90-(x+30)

= sin(90-x-30)

= sin(60-x)

Substitute

$\frac{sin(60-x)-sin(x+60)}{sin(x)cos(x)} \\= \frac{sin60cosx-cos60sinx)-sinxcos60-cosxsin60)}{sin(x)cos(x)} \\= \frac{-2cos60sinx)}{sin(x)cos(x)} \\= \frac{-2(1/2)sinx)}{sin(x)cos(x)} \\= \frac{-1}{cos(x)}\\= \frac{1}{cos(x)}\\ \\= -sec(x) Proved$

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3 years ago