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2 years ago

2cos^2A-cos2A-1=0 Help

Mathematics

1 answer:

kondor19780726 [428]2 years ago

8 0

Answer:

steps below

Step-by-step explanation:

Are you going to solve the value of A or just a proof the equation

cos 2A = cos² A - sin² A

2cos²A-cos2A-1 = 2cos²A - (cos² A - sin² A) - 1 = cos² A + sin² A - 1

2cos²A-cos2A-1 = 1 - 1 = 0

A: 90° or 270° or 450° .....

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WHAT IS THE PRODUCT OF: 7.21 x 4.2<br> PLEASE--

lesantik [10]

<h3><u>QU</u><u>ESTION</u><u>:</u></h3>

WHAT IS THE PRODUCT OF: 7.21 x 4.2

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<h3>SOLUTION AND ANSWER:</h3>

$\: \: \: \: \sf7.2 \: 1 \\ \sf \times \: \: \: \: 4.2 \\ \: \: \sf \overline{1 \: 4 \: 4 \: 2} \\ \sf + \: 2 \: 8 \: 8 \: 4 \: 0 \: \: \: \: \: \\ \sf \overline{ \orange{3 \: 0.2 \: 8 \: 2}}$

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HOPE THIS HELP YOU! HAVE A NICE DAY!

~kimtaetae92~

NOTE: Kindly see this answer from brainly app if you are in web to see the displayed formats here.

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2 years ago

Two angles are supplementary. One angle is 16° less than three times the other. Find the measures of the angles

Ivan

Answer:

Step-by-step explanation:

x and y are supplementary angles, so their sum is 180°.

x+y = 180°

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2 years ago

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Step-by-step explanation:

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