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Proceeding in solving the equation we get,
=cosQ=4/5  [.·. cosQ=1/secQ]
Now finding the value of sinQ,
hence value of sinQ=3/5

Now finding the value of cotQ,
hence value of cotQ=4/3

Now finding the value of tanQ,
tanQ=3/4 [.·. tanQ=1/cotQ]

Now putting all the values in the above equation,
We get,

Hence, proved.
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