The right answer is 9 units.
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A. Scalene B. Acute C. Equilateral D. Isosceles E. Right F. Obtuse
1 answer:
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Answer:
Identity (a) can be re-written as
which we already proven in another question, while for idenity (b)
step A is simply expressing each function in terms of sine and cosine.
step B is adding the terms on the LHS while multiplying the one on RHS.
step C is replacing the term on the numerator with the equivalent from the pithagorean identity
