Evaluate tan 35°/cot 55°+cot 78°/tan 12°− 1

+1 vote
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asked Feb 16, 2018 in Mathematics by sforrest072 (157,439 points) 63 450 1292
edited Mar 6, 2018 by faiz
Evaluate  tan 35°/cot 55°+cot 78°/tan 12°− 1

1 Answer

+1 vote
answered Feb 16, 2018 by mdsamim (213,225 points) 5 10 23
edited Mar 6, 2018 by faiz
 
Best answer
Tan 35° = tan (90°-55°) = cot 55°

Cot 78°= cot (90°-12°) = tan 12°

cot 55°/cot 55°+ tan 12°/tan 12°-1

=1+1-1

=2-1

=1

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