tentukan nilai dari 1. sin 45° + cos 45° 2. sin 60° cos 30° + cos 60° sin30 ° 3.cos 30° cos 60°- sin 30° sin60°

1. sin 45° + cos 45° =1/2√2+1/2√2=√2

2. sin 60° cos 30° + cos 60° sin30 ° 3.cos 30° cos 60°- sin 30° sin60°= (1/2√3x1/2√3)+(1/2x1/2x3x1/2√3x1/2)-(1/2x1/2√3)=(1/4.3)+(1/4.3.1/4√3)-(1/4√3)=3/4+3/4.1/4√3-1/4√3
=3/4+3/8√3-1/4√3=6/8+3/8√3-1/8√3=6/8+2/8√3.

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