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Question

Evaluate:

sec θ cosec 90°-θ-tan θ cot 90°-θ+sin2 55°+sin2 35°tan 10° tan 20° tan 60° tan 70° tan 80°

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Solution

Here we to evaluate the value of the expression given as follow

Now we are using the following identities

Therefore the given expression can be written as

Hence the value of the given expression is


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