# Pre Calculus Trigonometric functions

*label*Mathematics

*timer*Asked: Dec 23rd, 2017

*account_balance_wallet*$15

**Question description**

**Seven multiple choice questions: Given tan( A) = 2 and A is in Quadrant I, find sin(2A); find cos(2A); find tan(2A). **

**If angle A is 45 degrees and angle B is 60 degrees f**

**ind sin(A)cos(B); find cos(A)sin(B); find sin(A)sin(B); find cos(A)cos(B).**## Tutor Answer

Here is my answer :)

Given tan(A) = 2 and A is in Quadrant I, find sin(2A).

0

1

1/2

4/5

tan(𝐴) = 2

𝐴 = tan−1 (2) = 63.43

Then,

sin(2𝐴) = sin(2 ∗ 63.43)

𝐬𝐢𝐧(𝟐𝑨) = 𝟒/𝟓

Given tan(A) = 2 and A is in Quadrant I, find cos(2A).

0

1

1/2

-3/5

tan(𝐴) = 2

𝐴 = tan−1 (2) = 63.43

Then,

cos(2𝐴) = cos(2 ∗ 63.43)

𝐜𝐨𝐬(𝟐𝐀) = −𝟑/𝟓

Given tan(A) = 2 and A is in Quadrant I, find tan(2A).

-1/3

2/3

-4/3

-2/3

tan(𝐴) = 2

𝐴 = tan−1 (2) = 63.43

Then,

tan(2𝐴) = tan(2 ∗ 63.43)

𝐭𝐚𝐧(𝟐𝑨) = −𝟒/𝟑

If angle A is 45 degrees and angle B is 60 degrees.

Find sin(A)cos(B)

½ (sin(105) + sin(345))

½ (sin(105) - sin(345))

½ (sin(345) + cos(105))

½ (sin(345) - cos(105))

Using Product-to-Sum Formulas

1

sin(𝐴) cos(𝐵) = [sin(𝐴 + 𝐵) + sin(𝐴 − 𝐵)]

2

1

sin(𝐴) cos(𝐵) = [sin(45 + 60) + sin(45 − 60)]

2

1

sin(𝐴) cos(𝐵) = [sin(105) + sin(−15)]

2

𝟏

sin(𝐴) cos(...

*flag*Report DMCA

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors