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निम्नलिखित का मान ज्ञात कीजिए । cos (4...

निम्नलिखित का मान ज्ञात कीजिए ।
`cos (40^(@) + theta) - sin (50^(@) - theta) + (cos^(2) 40^(@) +cos^(2) 50^(@))/(sin^(2) 40^(@) +sin^(2) 50^(@))`

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