已知a∈(3π/4,5π/4),sin(a-π/4)=5/13,则sina的值为多少?
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已知a∈(3π/4,5π/4),sin(a-π/4)=5/13,则sina的值为多少?
已知a∈(3π/4,5π/4),sin(a-π/4)=5/13,则sina的值为多少?
已知a∈(3π/4,5π/4),sin(a-π/4)=5/13,则sina的值为多少?
3π/4