Step-by-step explanation:
Since cot²θ + 1 = csc²θ,
we have cot²θ + 1 = [1 / (4/5)]².
=> cot²θ + 1 = 25/16
=> cot²θ = 9/16
=> cotθ = -3/4 (as sine is +ve and cosine is -ve)
=> tanθ = -4/3. (A)
-7/8
step-by-step explanation:
instead of subtracting you add the -6/8 and -1/8