Question

What is the value of sin 20°-cos 70°

Answer 1

Answer:

0

Step-by-step explanation:

sin20 - cos(90-20)

sin20-sin20 = 0

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Answer 2

The value of sin 20°-cos 70° is 0

Step-by-step explanation:

To find: The value of sin 20°-  cos 70°

According to question we have

sin 20°-  cos 70°

rewrite the equation                  

sin(90°-70°) - cos 70°                (∴sin(90°-70°) =sin 20°)

As we know

sin(90°-∅)=cos ∅

Therefore

cos 70° - cos 70° = 0

Hence the value of sin 20°-cos 70° is 0

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