matt is playing a game. he gains 7 poins loses 10 poins, gains 2 points, and then loses 8 points what is his final score
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You want to be finding out what two factors (where one of them is a perfect square) has the produce of 63. It seems like 9 x 7 (9 is the perfect square) works.
The square root of 9 is 3 so we can just have
(which just means 3 times the square root of 7).
The square root of 9 is 3 so we can just have
LHS: = 
(using 
)
We know
so we can replace the sin²x in the LHS expression as follows
which is the RHS.
We know