Find the exact value of the following expression cotminus855

Find the exact value of the following expression. cot(minus855)Degree cot(minus855)Degree = controlDEL (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)

Solution

cot(-855)

we know 720 +135 = 855

so cot(-135)

remember the point cot(90+theta) = tan (theta) with positive value

cot(-90+(-45))

tan(45) = 1

Answer