sin20/cos70+1/2(tan20/cot70)
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Answer:
sin20/cos70 + 1/2(tan20/cot70)
sin20/cos(90-20)+1/2(tan20/cot(90-20)
sin20/sin20+1/2(tan20/tan20)
1+1/2×1
1+1/2
3/2
#666
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