Math, asked by iqra14tahreem, 9 months ago

please explain this question how to do this

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Answered by aryakittukrishnasai

3

Answer:

proved

Step-by-step explanation:

2cosxcosy =cos(x+y) +cos(x-y)

cosC-cosD= 2sin(C+D/2)sin(C-D/2)

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