can you solve question no. 16 for me
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we can write l.h.s. like this
cos(pie/8)+cos(7pie/8) + cos(3pie/8)+cos(5pie/8)
=2ços(pie/8+7pie/8)/2 cos (pie/ 8-7pie/8)/2+same formula second part
= 2cos(pie/2)cos(-6pie/2) +2cos(pie/2).cos(-6pie/2)
=0 because cos(pie/2)=0
cos(pie/8)+cos(7pie/8) + cos(3pie/8)+cos(5pie/8)
=2ços(pie/8+7pie/8)/2 cos (pie/ 8-7pie/8)/2+same formula second part
= 2cos(pie/2)cos(-6pie/2) +2cos(pie/2).cos(-6pie/2)
=0 because cos(pie/2)=0
abhishek711:
thank u soo much
manu
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