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表情がありますcos(phi) + sin(phi)。、および とx+y仮定して、この式を最大値で変換するにはどうすればよいですか?cos(phi) is xsin(phi) is y
cos(phi) + sin(phi)
x+y
cos(phi) is x
sin(phi) is y
あるいは単に
(%i1) cos(phi) + sin(phi), cos(phi) = x, sin(phi) = y; (%o1) y + x