√2(cos50°-sin50°).化简

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√2(cos50°-sin50°).化简
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√2(cos50°-sin50°).化简
√2(cos50°-sin50°).化简

√2(cos50°-sin50°).化简
√2(cos50°-sin50°)
=√2*√2(cos50°cos45°-sin50°sin45°)
=2cos(95°)
=-2sin5°

√2(cos50°-sin50°)
=2(√2/2cos50°-√2/2sin50°)
=2(sin45°cos50°-cos45°sin50°)
=2sin(45°-50°)
=2sin(-5°)
=-2sin5°