Answers

  • JNZ
  • Ambitious
2015-10-08T15:15:23+05:30

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Cos20°×cos40°×cos60°×cos80°
={1/2sin20°}2sin20°cos20°cos40°cos60°cos80°
={1/2sin20°}sin40°cos40°cos60°cos80°
={1/4sin20°}2sin40°cos40°cos60°cos80°
={1/4sin20°}sin80°cos60°cos80°
={1/8sin20°}2sin80°cos80°1/2
={1/16sin20°}cos160°
=1/16

hence proved


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2 4 2
answer is correct except.... it is not cos 160 but sin 160.