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3 years ago

Find sin18 /cos72please help I am writing exam

Mathematics

2 answers:

faust18 [17]3 years ago

5 0

Answer:

sin 18 = cos ( 90 - 72 ) = sin 18

so,

sin 18 / cos 72 = sin 18 / sin 18 = 1

Step-by-step explanation:

so required answer is 1

tekilochka [14]3 years ago

3 0

Answer:

sin18/cos72= sin(18) sec(72)

Step-by-step explanation:

rewrite it as a product: sin(18)/1 * 1/cos(72)

Divide sin(18) by 1 and rewrite 1/cos(72) as sec(72): sin (18) sec (72)

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baherus [9]

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3 years ago

What’s the answer?!!!!!!

Sergio [31]

Answer:

Step-by-step explanation:

Using the converse of Pythagoras' identity.

If the square of the longest side is equal to the sum of the squares of the other 2 sides then the triangle is right.

longest side = 30 , then 30² = 900

20² + 23² = 400 + 529 = 929 ≠ 900

Then the triangle is not right.

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3 years ago

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3 years ago

3x+30+x=10+2x+5x+2 <br> i need help fast

kupik [55]

Answer:

x=6

Step-by-step explanation:

Group Like Terms:

3x+x+30=10+2x+5x+2

Add similar elements 3x+x=4x:

4x+30=10+2x+5x+2

Add similar elements 2x+5x=7x:

4x+30=10+7x+2

Group like terms:

4x+30=7x+10+2

Add the numbers 10+2=12:

4x+30=7x+12

Subtract 30 from both sides:

4x+30-30=7x+12-30

Simplify:

4x=7x-18

Subtract 7x from both sides:

4x-7x=7x-18-7x

Simplify:

-3x=-18

Divide both sides by -3:

$\frac{-3x}{-3} =\frac{-18}{-3}$

Simplify:

x=6

Hence, the correct answer is 6

4 0

2 years ago

Find sin18 /cos72please help I am writing exam​

Find sin18 /cos72please help I am writing exam