4. Verify. COSX 1+sinx = 2secx %D а. 1+sinx COSX b. cosx(1+ tanx)² = secx + 2sinx %3D

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A: according to our guidelines we can answer only three subparts and rest can be reposted thanku.

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A: according to our guidelines we can answer only first question and rest can be reposted.