Question

x = (ottaneo) (ottanz) : .. (1 te
y=(1-tan 136) (1-tan137)..(1-tas
9​

Answer 1

Answer:

Step-by-step explanation:

We have,  

cos

2

x

=

cos

2

x

−

sin

2

x

=

cos

2

x

−

sin

2

x

1

,

=

cos

2

x

−

sin

2

x

cos

2

x

+

sin

2

x

,

=

cos

2

x

{

1

−

sin

2

x

cos

2

x

}

cos

2

x

{

1

+

sin

2

x

cos

2

x

}

.

⇒

cos

2

x

=

1

−

tan

2

x

1

+

tan

2

x

, as desired!

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