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Prove that:(i) sin (60° − θ) cos (30° + θ) + cos (60° − θ) sin (30° + θ) = 1.(ii) sin4π9+7cosπ9+7-cos4π9+7sinπ9+7=32(iii) sin3π8-5cosπ8+5+cos3π8-5sinπ8+5=1 |
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Answer» Prove that: (i) sin (60° − θ) cos (30° + θ) + cos (60° − θ) sin (30° + θ) = 1. (ii) (iii) |
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