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Some Applications Of Trigonometry

Question

The value of: $fraction numerator cot space 40 degree over denominator tan space 50 degree end fraction minus 1 half open parentheses fraction numerator cos space 35 degree over denominator sin space 55 degree end fraction close parentheses$ is

$1 half$
$negative 1 half$
$2 over 3$
$2 over 5$

Solution

1 half