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To 2 decimal places, what is the value of the lower-right entry in the reflection matrix $Q_a $if a = 1.05?

Not even sure where to begin, is there a formula?

This is what I could find in my textbook enter image description here

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    "in the reflection matrix $Q_a$" - what is the definition of $Q_a$ ?2012-10-21
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    Thats it the question I was given.2012-10-21
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    @Belgi this has to do with transformations2012-10-21
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    There is no universal definition of $Q_a$. You're going to have consult your textbook, class notes, or your instructor to determine the meaning of this symbol before proceeding.2012-10-21
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    @MichaelJoyce I have edited my question please take a look.2012-10-22

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