Show us some work.
What do you have?
Where are you stuck?
But where did the first sin(x) go?
It is possible to solve the equation if you factorise it, but then we assume that the first sin(x)=0? Then, sin(x)=0; sin(x)=0 ; cos(x)=2
And can you please confirm the first equation(d). The answer in the book is different.
Thanks in advance!
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