How is tan 42 cot 42 into cot 67 tan 67 equal to 1? or please explain the last step of textbook exercise 8.3, 2nd question 1st problem.....please...

Asked by Kishore Joshi | 23rd Jun, 2015, 12:26: PM

Expert Answer:

tan 42 space c o t 42 space cross times space c o t 67 tan 67 equals tan 42 cross times fraction numerator 1 over denominator tan 42 end fraction cross times c o t 67 cross times fraction numerator 1 over denominator c o t 67 end fraction equals 1 space left parenthesis a l l space t e r m s space g e t s space c a n c e l l e d space o u t right parenthesis

Answered by satyajit samal | 24th Jun, 2015, 08:45: AM