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Question

Find the values of tan60otan30o1+tan60o.tan30o+(sin30o.cos60o+cos30o.sin60o).

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Solution

Now,
tan60otan30o1+tan60o.tan30o+(sin30o.cos60o+cos30o.sin60o)
=tan(60o30o)+sin(30o+60o) [ Using the direct formulas for tan(AB) and sin(A+B)]
=tan30o+sin90o
=13+1
=3+13.

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