Math, asked by sidd47, 1 year ago

if a = 30begree ; find cos^2a = 1-tan^2a/1+tan^2a

Answers

Answered by KRIT111
1
Cos^2A=Cos^30 =(√3/2)^2= 3/4

1-tan^2a/1+tan^2a

= 1-(1/√3)^2/1+(1/√3)^2

=2/3//4/3=1/2

it must be cos2a

sidd47: as 1+tan^2a = sin^2a
sidd47: value =2 / ur3
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