(sin 70°+ cos 20°) (cos20°- sin70°)=
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Answered by
1
Answer:
0
Step-by-step explanation:
sin70=sin(90-20)=cos20
sin70+cos20 )(cos20-cos20)
=(sin70+cos20)(0)
=0
Answered by
0
Answer:
sin20° cos70° + sin70° cos20° = cos(90° – 20°)cos70° + sin70° sin(90° – 20°) = cos 70° cos70° + sin70° sin70° = cos270° + sin270° = 1Read more on Sarthaks.com - https://www.sarthaks.com/649207/the-value-of-sin20-cos70-sin70-cos20-is?show=649217#a649217
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