Answer:
See below
Step-by-step explanation:
It has something to do with the<em> </em><u><em>Weierstrass substitution</em></u>, where we have
First, consider the double angle formula for tangent:
Therefore,
Once the double angle identity for sine is
we know , but sure, we can derive this formula considering the double angle identity
Recall
Thus,
Similarly for cosine, consider the double angle identity
Thus,
Hence, we showed
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Solving
Just note that
and is not defined for
Answer:
x=2; the extraneous root x=42.
All the details are in the attached picture, the answer is marked with red colour.
First you should write 2 3/4 as a decimal, 2.75 then multiply 2.75 by 2 to get 5.5. 5.5 equals 5 1/2.
Ms. Addison needs 5 1/2 cups of flour.
Answer:
$2.50+$1.25 times M
Step-by-step explanation:
$10.75-$8.25=$2.50
$3.50-$2.25=$1.25
$2.50+$1.25=$3.75
As only one-time fee, we cancel out it, then only add on the per-month fee, which is $1.25 every month.