help me please.......
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cot60°
Step-by-step explanation:
cot12° cot38° cot52° cot60° cot78°
=(1/tan12°) (1/tan38°) {cot(90°-38°)} (cot60°) {cot(90°-12°)}
=(1/tan12°) (1/tan38°) (tan38°) (cot60°) (tan12°)
=cot60°
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