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


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

Grade:

1 Answers

shivang belwariar
35 Points
9 years ago

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

 



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