Prove that cos^2A+COSx^{2} A+sinx^{2} Bcos2A = sinx^{2} B+cosx^{2} Acos2B

The product of two negative rational numbers is always zero sometimes zero never zero

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²