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Show that
=1
L.H.S:
=
[
∵
]
=
[
∵
]
=
=
[
∵
cos
2
θ + sin
2
θ = 1]
=
[
∵
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= 1
:R.H.S
13
=1
[∵ 
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[∵ 
]
[∵ cos2 θ + sin2 θ = 1]
[∵ 
]=1 [∵ ] [∵ ] [∵ cos2 θ + sin2 θ = 1] [∵ ]