Mathematics
Senior High

(2)なのですが、なぜ2θ+π/6=π/6は含まれないのですか?

□ 27900 <2のとき、次の方程式、不等式を解け。 (1) cos(20-5) = 1/2 3 *(3) cos(20+7)<-√3 1 *(2) sin( sin (20+5)=√2 tan (20+)²-√3 √3

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