2 years ago

Please help me I will give BRAINLY , 5 STARS and a THANKS

Mathematics

2 answers:

Dima020 [189]2 years ago

8 0

4/3 or in simplest form 1 1/3 or in decimal form 1.3

kramer2 years ago

5 0

Answer:

By simplifying the expression we get

4/3

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Question 16 (Essay Worth 7 points)<br><br> Verify the identity.<br><br> tan (x + π/2) = -cot x

Rus_ich [418]

Step-by-step explanation:

We know that tan=sin/cos, so tan(x+π/2)=

$\frac{sin(x+pi/2)}{cos(x+pi/2)}$

Then, we know that sin(u+v)=sin(u)cos(v)+cos(u)sin(v),

so our equation is then

$\frac{sin(x)cos(\pi/2)+cos(x)sin(\pi/2)}{cos(x+\pi/2)} = \frac{cos(x)}{cos(x+\pi/2) }$

Then, cos(u+v)=cos(u)cos(v)-sin(u)sin(v), so our expression is then

$\frac{cos(x)}{cos(x)cos(\pi/2)-sin(x)sin(\pi/2)} = \frac{cos(x)}{-sin(x)} = -cot(x)$

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3 years ago

Find the perimeter of a rectangular strip of board is 3.28m long and 7.5m

OLEGan [10]

Answer:

21.56 m

Step-by-step explanation:

2(3.28) + 2(7.5)

(twos represent the sides)

6.56 + 15

= 21.56 m

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3 years ago

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Anna11 [10]

X/4-9=5
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x=14/4
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3 years ago

Questions 11, 13 and 14 on the sheet with working out.

yKpoI14uk [10]

I cant get to the pic.

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3 years ago

Evaluate the expression. -3 + (-2)

mart [117]

That's answer exactly is -5

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3 years ago