haileyw315
haileyw315
10-06-2016
Mathematics
contestada
cos2a=1-2sin^2a for all values of a.
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nobillionaireNobley
nobillionaireNobley
16-06-2016
[tex]cos2a= cos^{2} a- sin^{2} a \\ but \ cos^{2} a + sin^{2} a=1 \\ i.e. \ cos^{2} a=1- sin^{2} a[/tex]
Therefore,
[tex]cos2a=1- sin^{2} a- sin^{2} a \\ =1-2 sin^{2} a[/tex]
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turanganik
turanganik
30-07-2018
true (just did this on apex)
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