If cos theta = 4/5 then cos2theta=
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cos2theeta=8/5 answer
Answered by
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1 + cos 2theta =2 cos ^2 theta
cos 2theta =2 cos ^2 theta -1
=2*(4/5)^2-1
= 32/25 -1
=7/25
cos 2theta =2 cos ^2 theta -1
=2*(4/5)^2-1
= 32/25 -1
=7/25
keerthana27:
Say in a simple way
ans is
7/25
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