find the value of cos square 40 degree + sin square 30 degree
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cos
2
48
o
−sin
2
12
o
=cos(48+12)cos(48−12)[cos
2
A−sin
2
B=cos(A+B)cos(A−B)]
=cos60×cos36=
2
1
×
4
5
+1
8
5
+1
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