(1-sin theta)(1+sin theta)
Answers
Answered by
1
Answer:
Multiply, using the shortcut
(
a
+
b
)
(
a
−
b
)
=
a
2
−
b
2
.
1
−
sin
2
θ
=
cos
2
θ
Apply the pythagorean identity
sin
2
θ
+
cos
2
θ
=
1
→
cos
2
θ
=
1
−
sin
2
θ
:
1
−
sin
2
θ
=
1
−
sin
2
θ
Identity proved!
Hopefully this helps
Answered by
0
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