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Question

If tan25=a then the value of tan205tan115tan245+tan335 in terms of 'a' is_______

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Solution

tan205tan115tan245+tan335
=tan(180+25)tan(90+25)tan(27025)+tan(36025)
=tan25(cot25)cot25+tan25
=a+1a1aa
=a2+1a1+a2a
=1+a21+a2
=1

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