Tan15tan25tan35tan45tan55tan65tan75
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we will be left with tan45 = 1
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hope it helps you....
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sol-- tan15.tan25.tan35.tan45.tan55.tan65.tan75
tan(90-75).tan(90-65).tan(90-55).tan75.tan65.tan55.tan45
cot75.tan75.cot65.tan65.cot55.tan55.tan45
1/tan75.tan75.1/tan65.tan65.1/tan55.tan55.tan45
tan45=1
i think so this is right answer
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