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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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