Math, asked by keerthana27, 1 year ago

If cos theta = 4/5 then cos2theta=

Answers

Answered by kannupriya1

1

cos2theeta=8/5 answer

Answered by anuj

1

1 + cos 2theta =2 cos ^2 theta
cos 2theta =2 cos ^2 theta -1
=2*(4/5)^2-1
= 32/25 -1
=7/25

keerthana27: Say in a simple way

anuj: ans is

anuj: 7/25

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