Question

1. If A = 30°. Verify that:
(a) cos 2A = 1- tan^2A/1+tan^2A​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

A=30°

cos 2A=1-tan2A/1+ tan2A

cos 2*30=1 -tan2 30/1+tan2 30

cos 60=1-(1/√3)^2/1+(1/√3)^2

1/2=(1-1/3)/(1+1/3)

=>(3-1/3)/(3+1/3)

=>(2/3)/(4/3)

=>2/4

=> 1/2

Hence proved