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a2cos2 + b2sin2 + 2absincos = m2
a2sin2 + b2cos2 - 2absincos =n2
a2(sin2+cos2) +b2(sin2 +cos2) = m2+n2
a2+b2 = m2+n2
a2sin2 + b2cos2 - 2absincos =n2
a2(sin2+cos2) +b2(sin2 +cos2) = m2+n2
a2+b2 = m2+n2
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option ( d ) is correct
I hope this helps you.
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I hope this helps you.
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