निम्नलिखित के मान ज्ञात कीजिए : (a si...

निम्नलिखित के मान ज्ञात कीजिए :
`(a sin 63^(@) cos 27^(@) + cos 63^(@) sin 27^(@)`
`(b ) sin 75^(@)`
`( c) sin 47^(@) cos 17^(@) - cos 47^(@) sin 17^(@)`

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