A thief stole a sine and a cosine... He took the two identities to a beach. However, they were too heavy for him to carry.
He wanted to keep them under the sand, but the beach was so narrow that it could only contain one of them: sine or cosine. He decided that, using his mathematical skills, that he would stack sine over cosine - but that resulted in tan! He did not want to get tan. So he stacked cosine over sine... <...
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