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(2) Which one of the following expressions is equivalent to sin (A+B)?
① sin A + cos B
② sin A - cos B
③ sin A cos B
④ sin A cos B + cos A sin B
Himeji Mizuki's Answer:
(1) X = π/6
(2) ④
Teacher's Comment:
That's right. You can write the angle with the symbol π instead of °. Your answer is perfect.
Tsuchiya Kouta's Answer:
(1) X = probably 3
Teacher's Comment:
I think you're trying to ...
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