admin百科知識 2022-02-13 18:55:55 已知cos(a-派6)+sina=45根號3,則sin(a+76派)的值是?求詳解已知cos(a-派/6) sina=4/5根號3,則sin(a 7/6派)的值是?求詳解網友廻答：匿名網友cos(a-π/6) sina=4√3/5cosa*cos(π/6) sina*sin(π/6) sina=4√3/5(√3/2)*cosa (3/2)*sina=4√3/5√3*sin(a π/6)=4√3/5所以sin(a π/6)=4/5故sin(a 7π/6)=sin(a π/6 π)=-sin(a π/6)=-4/5如果不懂,請Hi我,祝... db標簽 生活常識_百科知識_各類知識大全»已知cos(a-派6)+sina=45根號3,則sin(a+76派)的值是?求詳解
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