√2sin22.5°cos22.5°=?

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√2sin22.5°cos22.5°=?√2sin22.5°cos22.5°=?√2sin22.5°cos22.5°=?√2sin22.5°cos22.5°=2sin22.5°cos22.5°√2/2

√2sin22.5°cos22.5°=?
√2sin22.5°cos22.5°=?

√2sin22.5°cos22.5°=?
√2sin22.5°cos22.5°=2sin22.5°cos22.5°√2/2=sin45√2/2=1/2