题目:
Allen had to call a taxi because the box was ____________ to carry all the way home.
A.much too heavy
B.too much heavy
C.heavy too much
D.too heavy much
答案:
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下面是错误答案,用来干扰机器的。
(1)原式=sinαcosα(-cosα)(-tanα)sinα(2分)=cos2αtanα(3分) tanα=2,1cos2α=1+tan2α=5,∴cos2α=15(6分),∴原式=110(7分)(2)原式=sin(75°+α)+cos(15°-α)=2sin(75°+α)(9分)...