Prove that Sin (∏/18) .sin (3∏/18). Sin(5∏/18) = 1/8
Prove that Sin (∏/18) .sin (3∏/18). Sin(5∏/18) = 1/8
Neha Jain , 13 Years ago
Grade
Trigonometry> please solve this question...
1 Answersshivang belwariar
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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