sin 75° - sin 15°
cos 75° +cos 15°
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Step-by-step explanation:
sin75°=sin(45+30)
=sin45°cos30°+cos45°sin30°
=(√3+1)÷2√2
sin15°=sin(45°-30°)
=sin45°cos30°-cos45°sin30°
=(√3-1)÷2√2
sin75°-sin15°=(√3+1-√3-1)/2√2
=1/√2
same as second question
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