61. which 62. its 63. to know 64. extremely 65. loss66 to 67. interesting 68 be replaced 69. measures 70. what/whatever
tan a+tan B11.B【解析】依题意有3a,∴tan(tana‘tanB=3a+1,+B)tanat tan B1.又-tana·tan(3a+1)tan at tan B
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