if √a^2=a ; √a^4=a^2 then √a^2 b^6 c^8
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Answered by
0
Step-by-step explanation:
Correct option is
B
45°
cosA=
2bc
b
2
+c
2
−a
2
cosA=
2(
6
)(
3
+1)
(
6
)
2
+(
3
+1)
2
−(2)
2
cosA=
2(
6
)(
3
+1)
6+(3+1+2
3
)−4
=
2
6
(
3
+1)
6+2
3
cosA=
2
2
(3+
3
)
6+2
3
=
2
2
(3+
3
)
2(3+
3
)
cosA=
2
1
A=45
o
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