By definition of sin(x) and cos(x):
If we divide sin(x) by cos(x):
We already know that this is equal to tan(x). Hence we have proven that [sin(x)/cos(x) = tan(x)].
Proof That tan(x) = sin(x)/cos(x)
By definition of sin(x) and cos(x):
If we divide sin(x) by cos(x):
We already know that this is equal to tan(x). Hence we have proven that [sin(x)/cos(x) = tan(x)].