Verify whether or not it is an identity
1+cosa/cota = sin2a

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

Consider the function y = f(x)=3^x the values of f(1/2) and f(1/4). rounded to the nearest hundredth, are__and__ respectively

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41