What’s the answer to this? you have to estimate

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

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

Seattle, washington is known for being rainy. one day last month, 8 inches of rain fell in 1 1/2 hours. what us the rate of the rainfall expressed in ft per plzzz write a proportion i will give you 100 points