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1/Cho tam giác ABC vuông tại A đường cao AH biết AB=27, AC=36 tính BC,AH,BH,HC 2/tìm tỉ số lượng giác của góc nhọn a biết cos a =12/13 3/ tính giá trị biểu thức sau A=9xtan2 độ x tan88 độ + sin bình phương 15 độ+ sin bình phương 75 độ-(6cot15 độ)/tan65 độ
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