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Prove that Sin (∏/18) .sin (3∏/18). Sin(5∏/18) = 1/8
7 years ago

Answers : (1)

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shivang belwariar
35 Points 
							
Sin (∏/18) .sin (3∏/18). Sin(5∏/18) = 1/8 


now - 


sin(3∏/18)1/2[2sin(∏/18)sin(5∏/18)]


 


[sin(∏/3) + cos(4∏/18)]*sin (∏/6)/2


 


= 1/8


 


plz click on yes below


 
7 years ago
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