Question

sin 170 + cos 170+sin 170 + cos 170 - sin 170 -cos 170

Answer 1

sin170 +cos170 +sin170 +cos170 -sin170 -cos 170
=sin170+ cos170
=sin(180-10) +cos(180-10)
=sin10 -cos 10
=sin10 -sin80
=
$2 \ \cos( \frac{80 + 10}{2} ) \sin( \frac{10 - 80}{2} )$
2cos45.(-sin35)
=
$- 2. \frac{1}{ \sqrt{2} }. \sin(35) \\ = - \sqrt{2} \sin(35)$
....hope it helps uh...
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