I need to understand how to do this by

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)

Sam is picking fruit from a basket that contains many different kinds of fruit. which set of events is independent?

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given