The value of cos 20° cos 70° - sin 20° sin 70°
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Apply Cos(A+B)= CosACosB -SinASinB
∴Here A=20°, B=70°
∴Cos(20°+70°) = Cos20°Cos70°-Sin20°Sin70°
=Cos(90°)
=0
∴Here A=20°, B=70°
∴Cos(20°+70°) = Cos20°Cos70°-Sin20°Sin70°
=Cos(90°)
=0
Answered by
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Answer:
0 is the answer
Step-by-step explanation:
cos 20⁰ cos 70⁰ - sin 20⁰ sin 70⁰
cos(a+b) = cosacosb - sinasinb
Now , by substituting a & b values as 20⁰ & 70⁰
cos(a+b) = cos ( 20⁰ + 70⁰)
= cos90⁰
= 0
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