化简:sin10'分之1 减去cos10'分之根号3;

问题描述:

化简:sin10'分之1 减去cos10'分之根号3;

=sin10'×cos10'分之(cos10'-根号3×sin10')
=2sin10'cos10'分之(1/2×cos10'-2分之根号3×sin10')
{把1/2化为sin30'把2分之根号3化为cos30'}
=sin20'/sin20'
=1