cos70 +cos50-cos10=0
Answers
Answered by
4
cos70+cos50-cos10=0
cos70=0.3420
cos50=0.6427
cos10=0.9848
so,
0.3420+0.6427
=0.9848
0.9848-0.9848
=0
hence proved
cos70=0.3420
cos50=0.6427
cos10=0.9848
so,
0.3420+0.6427
=0.9848
0.9848-0.9848
=0
hence proved
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Answered by
11
We know that cos a + cos b = 2 cos(a+b/2) cos(a-b/2).
cos 70 + cos 50 = 2 cos(60) cos 10
= 2 * 1/2 * cos 10
= cos 10.
cos 70 + cos 10 - cos 10 = cos 10 - cos 10
= 0.
cos 70 + cos 50 = 2 cos(60) cos 10
= 2 * 1/2 * cos 10
= cos 10.
cos 70 + cos 10 - cos 10 = cos 10 - cos 10
= 0.
no what ever I said was correct
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