<span>cos 4x + cos 2x = 2 - 2 sin^2 2x - 2 sin^2 x
cos 4x + cos 2x = 1 + 1 − 2sin^2(2x) − 2sin^2(x)
cos 4x + cos 2x = (1 - 2sin^2(2x)) + (1 - 2 sin^2(x)
cos 4x + cos 2x = cos 4x + cos 2x</span>
Answer:
first or last depending how you are rounding the decimal
=> the best fit is the first one
Step-by-step explanation:
y = 2.55x - 2.15 when x = 5 => y = 10.6 approximately 11
y = 3.21x - 1.75 when x = 5 => y = 14.3 cannot equal or approximately 11
y = -2.15x + 2.55 when x = 5 => y = -8.2 cannot equal or approximately 11
y = 1.75x + 3.15 when x = 5 => y = 11.9 approximately 11
Answer:
5
Step-by-step explanation:
hope this helps
Firstly you multiply 5 with everything in the brackets on the left side of = . and than you put t on the left side and change sign (if it was + then its going to be -) and numbers on right side and do the same with signs. then just calculate the rest
5(5t +1) = 25t - 7
25t + 5 = 25t - 7
25t - 25t = -7 + 5
0=-2
the statement is false
