2cosec67/sec23-tan70/cot20-cos theta+tan38•tan52
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Step-by-step explanation:
2cosec67°/sec(90°-67°)-tan70°/cot(90°-70°)-1+tan38°tan(90°-38°)
cos°=1
2cosec67°/cosec67°-tan70°/tan70°-1+tan38°cot38°
2-1-1+1=1
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