How can we do questions 3,4, and 5? 13. If sin a =and a is in quadrant I, use the double-angle identities to find sin (2x), cos (2x),and tan (2x). (Hint: find cos x and tan r first.)4. Use a half-angle identity to get the exact value of cos (15°). Do not use a calculator.5. Simplify 4 sinG) cos () using a doublc-anglc identity.CoS

Answered: Image /qna-images/answer/6f36481c-00c9-4d9f-a325-f06394e3c62f.jpg

3. If sin a and a is in quadrant I, use the double-angle identities to find sin (2x), cos (2x), 8 and tan (2r). (Hint: find cosr and tan r first.) 4. Use a half-angle identity to get the exact value of cos (15°). Do not use a calculator. 5. Simplify 4 sin ) using a double-anglec identity. CoS

3. If sin a and a is in quadrant I, use the double-angle identities to find sin (2x), cos (2x), 8 and tan (2r). (Hint: find cosr and tan r first.) 4. Use a half-angle identity to get the exact value of cos (15°). Do not use a calculator. 5. Simplify 4 sin ) using a double-anglec identity. CoS

Trigonometry (MindTap Course List)

8th Edition

ISBN:9781305652224

Author:Charles P. McKeague, Mark D. Turner

Publisher:Charles P. McKeague, Mark D. Turner

Chapter8: Complex Numbers And Polarcoordinates

Section8.4: Roots Of A Complex Number

Problem 42PS

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Question

How can we do questions 3,4, and 5?

1
3. If sin a =
and a is in quadrant I, use the double-angle identities to find sin (2x), cos (2x),
and tan (2x). (Hint: find cos x and tan r first.)
4. Use a half-angle identity to get the exact value of cos (15°). Do not use a calculator.
5. Simplify 4 sin
G) cos () using a doublc-anglc identity.
CoS

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