show that cos 38 cos 52 -sin 38 sin 52=0
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Answered by
344
Heyaa..!!
=> cos 38* cos 52* - sin 38* sin 52*
=> cos 38* cos ( 90* - 38* ) - sin 38* sin ( 90* - 38 * )
=> cos 38* sin 38* - sin 38* cos 38*
=> 0
Hope it helps...
And here CutieBarbie :)
=> cos 38* cos 52* - sin 38* sin 52*
=> cos 38* cos ( 90* - 38* ) - sin 38* sin ( 90* - 38 * )
=> cos 38* sin 38* - sin 38* cos 38*
=> 0
Hope it helps...
And here CutieBarbie :)
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Answered by
66
LHS=cos38cos52 - sin38sin52=
cos(38+52).
cos (90)
=0
=RHS
cos(38+52).
cos (90)
=0
=RHS
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