ANSWER
3) b
EXPLANATION
Given that:
and
Recall that the sine and cosine functions are equal for complementary angles.
This implies that,
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2 answers:
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First, square both sides. This will cancel out the radical.
(a^2 = b + 6)
Then subtract 6 from both sides
b = a^2 - 6
(a^2 = b + 6)
Then subtract 6 from both sides
b = a^2 - 6