If y=y(x) satisfies the differential equation 16(x+9x)(4+9+x)cosy dy=(1+2siny)dx,x>0 and y(256)=2π,y(49)=α, then 2sinα is equal to :
Held on 22 Jan 2026 · Verified 6 Jul 2026.
2(2−1)
3(2−1)
22−1
2−1
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