Answers

2015-08-04T20:26:51+05:30
 at first we can write 

tan35 = tan(90-55) = cot55

tan40 = tan(90-50) = cot50

tan45 = 1

then,

1.tan35 tan40 tan45 tan50 tan55 = 1
1.tan(90-55) tan(90-50). 1.tan 50 tan55 = 1
cot55 cot50 tan50 tan55 =1
cot55 cot50 1/cot50 1/cot55 = 1
1 = 1
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