In a triangle, the measure of the second angle is three times the measure of the first angle. The third angle is equal to the sum of the other angles.
N
Which of the following could represent the measures of the three angles?
O x, 3x, 4x
OX, 2x, 3x
O x 2x, 4x
O x, 3x, 3x
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What value of x is in the solution set of 4x – 12 s 16 + 8x?

Which shows the correct substitution of the values a, b and c from the equation 1=-2x+3x^2+1

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .