tan 15°= cot please answer
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tan 15 + cot 15
= sin 15 / cos 15 + cos 15 / sin 15
= (sin²15 + cos²15) / (sin 15 cos 15)
= 1 / (1/2 sin 30)
= 2 / sin 30
= 2 / (1/2)
= 4
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