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如图1,AP与平面α所成角是θ1,AC在平面α内,AC与AP在平面α内的射影AB所成角是θ2.AP与AC所成角是θ,则有
As shown in Figure 1, the angle formed by AP and plane α is θ1, AC is in plane α, and the angle formed by AC and AP in plane α is θ2. The angle formed between AP and AC is θ.