変形したりして使おう 三平方の定理から導き出せる x^2+y^2=r^2 cos^2θ+sin^2θ=r^2/r^2=1 例:sinA=√1-cos^2A
数学
Optimized studying based on the forgetting curve vastly improves memorization. - What is reminDO? Memorize 1
TPP11
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