evaluate:

Let us assume …......equation 1

By property, we know that

………………………equation 2

Adding equations 1 and 2, we get,

+

We know

Thus

We know that

If f(2a – x) = f(x)

than

thus

since sinx = sinπ – x

Now

By property, we know that

since 1/cosx = secx

since tan²x + 1 = sec²x

Let tanx = y

Sec²xdx = dy

Thus

For

y = ∞

For x = 0

tan 0 = y

y = 0

thus substituting in