x³sec²ydy/dx+3x²tany=cosx
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Answer:
cosx
Step-by-step explanation:
L.H.S.=
x© sec® y dy ÷ dx 3x® tan y
x sec® y ÷ x + 3 tan
sec® y ÷ 3tan
sec×sec×y ÷ 3×tan = 0
cosx
=R.H.S.
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