Mathematics

Mathematics

Problem

For 0∘≤θ<360∘0^{\circ}\le\theta<360^{\circ}, the equation sin⁡θcos⁡20∘+cos⁡θsin⁡20∘=cos⁡θ\sin\theta\cos 20^{\circ}+\cos\theta\sin 20^{\circ}=\cos\theta has the solution set a) 55∘,  235∘55^{\circ},\;235^{\circ} b) 70∘,  250∘70^{\circ},\;250^{\circ} c) 35∘,  215∘35^{\circ},\;215^{\circ} d) 80∘,  260∘80^{\circ},\;260^{\circ}

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