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If cosx/2dotcosx/(2^2)dotcosx/(2^3)oo=(s...

If `cosx/2dotcosx/(2^2)dotcosx/(2^3)oo=(sinx)/x ,` then find the value of `1/(2^2)sec^2x/2+1/(2^4)sec^2x/(2^2)+1/(2^6)sec^2x/(2^3)+oo`

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RESONANCE DPP-JEE MAINS-All Questions
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