If ∠A 300 and ∠B 600 ,verify that sin(A + B) = sinA cosB + cosA sinB
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ʜᴏᴩᴇ ꜱᴏ ɪᴛ ʜᴇʟᴩꜱ ᴜ ᴅᴇᴀʀ ꜰʀɪᴇɴᴅ
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