Answer:
k = 10
Explanation:
The initial polynomial is:
If f(-2) = 0, then when we replace x by -2, the result will be 0. It means that we can write the following equation:
Therefore, we can solve for k as follows:
So, the value of k is 10
The proof of the equation (sin²x) / (1-cosx) = (secx+1) / (secx) is given below.
<h3>What is trigonometry?</h3>
The connection between the lengths and angles of a triangular shape is the subject of trigonometry.
The equation is given below.
(sin²x) / (1-cosx) = (secx+1) / (secx)
Taking the left-hand side, then we have
⇒ [sin²x / (1 - cos x)] × [(1 + cos x) / (1 + cos x)]
⇒ [sin²x (1 + cos x)] / [1 - cos² x)]
⇒ [sin²x (1 + cos x)] / [sin² x)]
⇒ 1 + cos x
⇒ 1 + 1/sec x
⇒ (sec x + 1) / sec x = Right-hand side
More about the trigonometry link is given below.
brainly.com/question/22698523
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Answer:
The answer is "The threat to internal validity is mortality".
Step-by-step explanation:
It signifies that while in terms of your study, persons were "morning." It usually signifies when people leave the studies. There will be only likely if indeed the experiment lasts a long period that it'll be a substantial danger to validity and reliability because the chance for drops increases. Eight content validity risks are history, maturity, instrument, test, choice, average regress, human engagement, and mortality.