if sina-cosa=0 then the value of (sina+cos^4) is
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sinA−cosA=0
⇒A=cosA
⇒tanA=1
⇒A=
4
π
sin
4
A+cos
4
A=sin
4
4
π
+cos
4
4
π
=(
2
1
)
4
+(
2
1
)
4
=
4
1
+
4
1
=
2
1
.
solution
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