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5uckerberg

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Let

When

When you remove the negative sign you flip the boundaries.



The next one requires you to master trigonometric identities

Have a look at this when you see opposites you already could tell it will be in the form of depending on what is used.

Here, we are hunting for therefore, we will need something like this
.
As a matter of fact .
Thus,



i)

ii)Use to evaluate
To start
When and when

.

Using part i it becomes .

The question you saw here was the 3U version. You can turn this Q into a 4U question by removing the first part of the question and not giving you the substitution for the second part.
 
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