Sin4 (π/8)+ Sin4(3π/8)+ Sin4 (5π/8)+ Sin4 (7π/8)=2/3
sakar shrestha , 12 Years ago
Grade Upto college level
Discuss with colleagues and IITians> trigonometry question...
1 Answers
Neer Varshney
Last Activity: 12 Years ago
wirte sin^4(n/8) as (sin^2(n/8))^2 and than use the formula cos2x= 2sin^2x-1, implies sin^2x= 1+cos2x/2
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