D
解析分析：求出函數(shù)y=sinx在
處的導(dǎo)數(shù)值，這個(gè)導(dǎo)數(shù)值即函數(shù)圖象在該點(diǎn)處的切線的斜率．
解答：因?yàn)楹瘮?shù)y=sinx，所以導(dǎo)函數(shù)y′=cosx，函數(shù)y=sinx的圖象上一點(diǎn)
處的切線的斜率為：y′
=cos
=
．故選D．
點(diǎn)評(píng)：本題考查導(dǎo)數(shù)的幾何意義，考查導(dǎo)數(shù)的求法，計(jì)算能力．
C.
D.