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Prove that sin(30°) = sin (390°)

DarkKnight  Jun 30, 2017

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 #2
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Prove that sin(30°) = sin (390°)

 

I suppose that depends on what you are allowed to use for your proof.

How about

 

sin390 = sin(360+30) = sin360cos30+sin30cos360 = 0+sin30 =sin30

Melody  Jul 1, 2017
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 #1
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Sin(390) = sin(360 + 30) = sin(30) = 1/2

Sin(360) =0

Sin(390) = sin(0 + 30) =sin(30) = 1/2

Guest Jun 30, 2017
 #2
avatar+90522 
+2
Best Answer

Prove that sin(30°) = sin (390°)

 

I suppose that depends on what you are allowed to use for your proof.

How about

 

sin390 = sin(360+30) = sin360cos30+sin30cos360 = 0+sin30 =sin30

Melody  Jul 1, 2017

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