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I need to write the expression as the sine of an angle Number 8

I need to write the expression as the sine of an angle Number 8-example-1
User Isurfbecause
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1 Answer

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26 votes
Answer:

sin (60° - 20)°

sin (40°)

Step-by-step explanation:

Note that:

sin(A - B) = sinAcosB - cosAsinB

The given trigonometric expression is:

sin 60° cos 20° - cos 60° sin 20°

Applying the addition rule of trigonometry written above:

sin 60° cos 20° - cos 60° sin 20° = sin(60° - 20°)

This can also be written as sin (40°)

User Joshua Spence
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