sinx=1 则x=2kπ+π/2 k=0,(+-)1,2,3.
sinx=0 则x=kπ k=0,(+/-)1,2,3.
cosx=1则x=2kπ k=0,(+/-)1,2,3.
cosx=0则x=kπ+π/2 k=0,(+/-)1,2,3.
tgx=1 则x=kπ+π/4 k=0,(+/-)1,2,3.
tgx=0 则x=kπ k=0,(+/-)1,2,3.
ctgx=1则x=kπ+π/4 k=0,(+/-)1,2,3.
ctgx=0则x=kπ+ π/2 k=0,(+-)1,2,3.
仅供参考