sin4A – cos4A = (a) 2 sin2A-1 (b) 2 cos2A-1(c)1-2sinA(d) 1-2cosA
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0
Answer:
I think it's answer is a 2sin2A-1
Answered by
0
Answer:
sin
4
A+cos
4
A
We have (a
2
+b
2
)
2
=a
4
+b
4
+2a
2
b
2
⇒a
4
+b
4
=(a
2
+b
2
)
2
−2a
2
b
2
Take a=sinA and b=cosA we get
sin
4
A+cos
4
A=(sin
2
A+cos
2
A)
2
−2sin
2
Acos
2
A
=1−2sin
2
Acos
2
A proved.
Step-by-step explanation:
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