How do you find the value of #sin 20(theta)# using the double angle identity?

Answer 1

Find sin (20) deg

Call sin 20 = t Apply the trig formula: #sin 3a = 3sin a - 4sin^3 a# #sin 60 = sqrt3/2 = 3t - 4t^3# We get an equation of third deg in t = sin 20. 4t^3 - 3t + sqrt3/2 = 0 I ask someone to help find the real roots by graphing calculator. Mine was lost. The answer should be: t = sin 20 = 0.342
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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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