Question

№2
2,4,6
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Answer 1

1)2cos90cos15=0
2)2sin15cos90=0
3)2cos2π/3*cosπ/4=2*(-1/2)*√2/2=-√2/2
4)-2sin2π/3sinπ/4=-2*√3/2*√2/2=-√6/2
5)2sinπ/4cosπ/3=2*√2/2*1/2=√2/2
6)2sin135cos30=2*√2/2*√3/2=√6/2