Asked by Alyssa
1)
Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number.
cos 12° cos 18° − sin 12° sin 18°
And Find its exact value.
2)
Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number.
sin 4pi/5 cos 7pi/15 - cos 4pi/5 sin 7pi/15
And find its exact value.
3)
Write the trigonometric expression in terms of sine and cosine, and then simplify.
tan θ / cos θ − sec θ
Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number.
cos 12° cos 18° − sin 12° sin 18°
And Find its exact value.
2)
Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number.
sin 4pi/5 cos 7pi/15 - cos 4pi/5 sin 7pi/15
And find its exact value.
3)
Write the trigonometric expression in terms of sine and cosine, and then simplify.
tan θ / cos θ − sec θ
Answers
Answered by
Steve
1) that would be cos(12°+18°) which I'm sure you know
2) sin(4π/5-7π/5)
3)
well,
tan/cos = sin/cos^2 and sec = 1/cos
2) sin(4π/5-7π/5)
3)
well,
tan/cos = sin/cos^2 and sec = 1/cos
Answered by
Alyssa
Thank you so much but are those the expressions or exact answers for the first two problems?
Answered by
Steve
they are expressions. You surely know the exact value of cos(30°)
as for sin(-3π/5) you would have to construct a pentagon and figure out some side lengths. figure out sin 36° and then sin 72° and then the sine of 108°.
as for sin(-3π/5) you would have to construct a pentagon and figure out some side lengths. figure out sin 36° and then sin 72° and then the sine of 108°.
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