To president lincoln, the main reason for fighting the civil war was to preserve the union.
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The correct response is True. The main reason for fighting the Civil War was to preserve the Union according to President Lincoln.

Explanation:

President Lincoln decided to engage in the Civil War because he felt it was his duty as President to preserve the Union at all costs. Although the slavery issue was another factor, it was not the main reason for Lincoln's decision to engage the Confederate States in war. Abraham Lincoln's presidential election in 1860 cause the Southern states to succeed because they feared that Lincoln who was anti-slavery would get rid of slavery, and Lincoln's aim in entering into the war was to bring the Union back together.

Step-by-step explanation:

Let the function be a cosine function

H(t)= A cos(B(t+C)) + D

Average height = -20 cm

The object's maximum and minimum heights are each 5 cm from its average height. Therefore:

Maximum Height,

Minimum Height ,  

The amplitude, A is denoted by :

The vertical shift, D is denoted by :

The period T is given by,

T=2 seconds

The phase shift , C is given by:

C=-0.2 (since it first achieves its average height to the right at t=0.2 sec)

Therefore, our function is defined as: