Sin 70 sin 20 - cos 20 cosec 70
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Sin 70 Sin20 - Cos20 Cos70?
1/2(2sin70 sin20)-(2cos 20 cos70)
1/2 cos (70 - 20)-cos (70+20) cos (20+70)+cos (20-70)
1/2(cos 50-cos90)(cos 90-cos 50)
1/2(cos50-cos 90.cos 90-cos50)
1/2(0.0) .....(cos90=0)
1/2 And.
1/2(2sin70 sin20)-(2cos 20 cos70)
1/2 cos (70 - 20)-cos (70+20) cos (20+70)+cos (20-70)
1/2(cos 50-cos90)(cos 90-cos 50)
1/2(cos50-cos 90.cos 90-cos50)
1/2(0.0) .....(cos90=0)
1/2 And.
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