1+cos(18x)=
a. 2cos^2(9x)
b. 2sin^2(9x)
c. 2cos^2(18x)
d.2sin^2(18x)

What two criteria are needed for triangles to be similar

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

Divide. –4.2 ÷ 6 = a –0.7 b 0.7 c –7 d 7 me