Final answer:
To factor and simplify the expression, start by factoring out the common factor of sin^2(x), then simplify using the fundamental identity.
Step-by-step explanation:
To factor the expression and use the fundamental identities to simplify, we can start by factoring out the common factor of sin^2(x) from both terms:
7 sin^2(x) sec^2(x) - 7 sin^2(x)
= 7 sin^2(x) (sec^2(x) - 1)
Next, we can simplify sec^2(x) - 1 using the fundamental identity sec^2(x) - 1 = tan^2(x):
= 7 sin^2(x) tan^2(x)
So, the simplified expression is 7 sin^2(x) tan^2(x).