What is the simplest form of 3/30

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

Select a graph that have an equation with a < 0