Mathematical proof of college entrance examination - Training Enrollment Network

Mathematical proof of college entrance examination

Examples of cos(α+β)=cosα+cosβ:

cos(α+β)= cosa * cosβ+Sina * sinβ= cosα+cosβ

So cosa*cosβ=cosα, sina*sinβ=cosβ.

Cosa=0, or cosβ= 1,

cosa=0，sina= 1，sinβ=cosβ，β=TT/4+2nTT，a=TT/28( 1+2n)

Cosβ= 1, no solution.

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