Cos7A+cos5A/sin7A+sun5A=cot6AProve it
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Step-by-step explanation:
cos7A+cos5A/sin7A+sin5A
=2cos(7A+5A/2)cos(7A-5A/2)/2sin(7A+5A/2)cos(7A-5A/2)
=2cos6AcosA/2sin6AcosA
=cos6A/sin6A
=cot6A
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