For cos(2x) * (2cos(x) + 1) = 0, use the double angle identity for cos(2x), which is cos^2 x - sin^2 x = cos^2 x - (1-cos^2) = 2cos^2 x - 1.
So we have (2cos^2 x - 1)(2cos x + 1) = 0. So 2cos^2 x -1 = 0 or x = 0 and 2pi.
For 2sec^2 x + tan^2 x - 3 = 0, use the identity sec^2 x = tan^2 x + 1, so we have
2(tan^2 x + 1) + tan^2 x - 3 = 0 or
<span>2tan^2 x + tan^2 x - 1 = 0 or
</span>3 tan^2 x = 1.
So x = pi/2, pi/2 + pi = 3pi/2.
Answer: c
Step-by-step explanation: because yes
Answer:
0.75 = 375/100
Step-by-step explanation:
375/100 = 3.75 and there is no 3 as the whole number.
To solve for n, you are trying to get n by itself on one side of the equation.
n/5 + 0.6 = 2
Subtract 0.6 on both sides
n/5 = 1.4
Multiply 5 on both sides to get n by itself
n = 7
