Question

If cosA=3/5find the value of sinA-1/tanA/

Answer 1

EXPLANATION

Cos A = 3/5 = b/h

h^2 = p^2 + b^2

p^2 = h^2 - b^2

p^2 = (5) ^2 - (3) ^2

p^2 = 25 - 9

p^2 = 16

p = 4

sinA = 4/5

tanA = 4/3

sinA - 1/tanA

4/5 - 1/4/3

4/5 - 3/4

16 - 15 / 20

1/20 = ANSWER