cos^2 48° - sin^2 12 ° =
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Answered by
2
cos^2 48^ - sin^2 12^
= cos^2 48^ -(1 - cos^2 12^)
=cos^48^ - 1 + cos^ 12^
=cos^2 60^ - 1
= (1/2)^2 -1
= 1/4 - 1
= -1/2
= cos^2 48^ -(1 - cos^2 12^)
=cos^48^ - 1 + cos^ 12^
=cos^2 60^ - 1
= (1/2)^2 -1
= 1/4 - 1
= -1/2
Answered by
3
Cos48= 0.6691 =0.67 =2/3 (approx)
So,
Cos2 48°= {2/3}2 =4/9
And cos12° 0.9781
Now, cos2 12°=(0.9781)²=0.9566
=0.96=96/100=24/25
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So,
Cos2 48°= {2/3}2 =4/9
And cos12° 0.9781
Now, cos2 12°=(0.9781)²=0.9566
=0.96=96/100=24/25
Plz mark add brainlist ans
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