Prove that : tan 15°+cot 15°=4
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Posted by (◍•ᴗ•◍)❤ . 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
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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