Find $\frac { d y } { d x }$ (A) $y = \ln \left( \cos ^ { 2 } x + 1 \right)$

question 136

Essay

Find $\frac { d y } { d x }$ .(a) $y = \ln \left( \cos ^ { 2 } x + 1 \right)$ (b) $y = \ln \ln x$

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