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goblinko [34]
3 years ago
5

PLEASE HELP! Will give Brainliest to the first person that answers correctly.

Mathematics
2 answers:
aliina [53]3 years ago
5 0

Answer:

Option A, 5/8 - 6/8

Step-by-step explanation:

<u>Step 1:  Find a common denominator</u>

5/8 is good

3/4 -> 3*2 / 4*2 -> 6/8

<u>Step 2:  Combine</u>

5/8 - 3/4 is now 5/8 - 6/8

Answer:  Option A, 5/8 - 6/8

BartSMP [9]3 years ago
3 0

Answer: It's A.

Step-by-step explanation: 8

=

2

⋅

4

, so we can expand the first fraction by  

2

to get equal denominator.

3

⋅

2

4

⋅

2

=

6

8

Give the person above brainliest please!

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4 0
3 years ago
Prove that:<br><br>cos20°cos40°cos80°=1/8​
Naya [18.7K]

Answer:

see explanation

Step-by-step explanation:

Using the double angle identity for sine

sin2x = 2sinxcosx

Consider left side

cos20°cos40°cos80°

= \frac{1}{2sin20} (2sin20°cos20°)cos40°cos80°

= \frac{1}{4sin20} (2sin40°cos40°)cos80°

= \frac{1}{4sin20} (sin80°cos80° )

= \frac{1}{8sin20} (2sin80°cos80° )

= \frac{1}{8sin20} . sin160°

= \frac{1}{8sin20} . sin(180 - 20)°

= \frac{1}{8sin20} . sin20°

= \frac{1}{8} = right side , thus proven

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Step-by-step explanation:

........................

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Step-by-step explanation:

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