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Alex
3 years ago
8

Prove (sinxsiny-cosxcosy)(sinxsiny+cosxcosy) =sin^2x-cos^2y

Mathematics
1 answer:
3241004551 [841]3 years ago
7 0

Step-by-step explanation:

Recall that \sin^2x + \cos^2x = 1

(\sin x \sin y - \cos x \cos y)(\sin x \sin y + \cos x \cos y)

= \sin^2 x \sin^2 y - \cos^2 x \cos^2 y

= \sin^2 x (1 - \cos^2 y) - \cos^2 x \cos^2 y

= \sin^2 x - \sin^2 x \cos^2y - \cos^2x \cos^2y

= \sin^2x - (\sin^2x + \cos^2x)\cos^2y

= \sin^2x - \cos^2y

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Puppy Liz has to run approx 70ft to get to fire hydrant from the bench post.

Step-by-step explanation:

Let bench post be point A, fire hydrant be B and electrical post bottom be C and top be O.

We are given CO = 40ft

and angle BOC = 34°

angle AOC = 34 +23 = 57°

Let AB be y and AC be x

Clearly two right triangles are formed.

We can say,

In triangle BOC,

cos34° = Perpendicular ÷ Base = x÷40 => x = 40cos34°

and In triangle AOC

cos57° = Perpendicular ÷ Base = (x+y)÷40

substituting value of x from first equation to second we get,

40cos57° = 40cos34° + y

y = 40(cos57° - cos34°)

y = 40x1.75

y = 70ft which is the required answer.

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3 years ago
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What is the kinetic energy of a 50-kg child running to catch the school bus at 2 m/s
aev [14]

Answer:

100 J

Step-by-step explanation:

The formula for kinetic energy is as follows:

\boxed{KE=  \frac{1}{2} mv²}

where

KE= kinetic energy (J)

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v= velocity (m/s)

Given: m= 50 kg, v= 2 m/s

Substituting the given information into the formula:

KE

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2 years ago
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3 years ago
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9514 1404 393

Answer:

  2)  (b) -7

  3)  (b) 14

Step-by-step explanation:

2) The sum is found by adding the numbers together. Your calculator can help if you can't do it in your head. I usually find it easier to add the positive and negative numbers separately. Of course the 0 can be ignored.

  18 + 0 -4 -12 +6 -15 = (18 +6) -(4 +12 +15) = 24 -31 = -7

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George is expected to miss 14 of the 40 pitches.

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