Mindblanked on these two questions any help appreciated (1 Viewer)

5uckerberg

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Hey there if any1 cud just guide me on how to approach these questions haven't touched them since late yr11 so a bit rusty rn
For this question , we can start working on this question knowing we need a trig term and a trig term.

Now the mechanical step.




Noting that



Knowing this
 

5uckerberg

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Have a look at the working out. If you need assistance someone will help interpret that information.
 

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