1. (cos^2 45°)(sin 30°) / tan^2 60° ans=1/12
2. cos30° cos45° + sin60° sin45° ans=√6/2
3. find θ ,
tan60° / sin(θ/3 +35°) ans: θ=75°
更新1:
打錯了第三題...sorry 3. find θ , tan60° / sin(θ/3 +35°)=√8 cos 45° ans: θ=75°