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सिद्ध कीजिए की: cos ( 30^(@) -A)+ cos ...

सिद्ध कीजिए की:
` cos ( 30^(@) -A)+ cos ( 30^(@) + A) =sin A `

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cos 60^(@) sin 30^(@) +cos 30^(@) sin 60^(@)=

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(sin ^ (2) 30 ^ (@) - cos ^ (2) 30 ^ (@)) / (sin ^ (2) 30 ^ (@) + cos ^ (2) 30 ^ (@)) =