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Zinaida [17]
3 years ago
5

IF 0 ≤theta°≤360°find cos(2theta-10°)=-1/2

Mathematics
1 answer:
aliina [53]3 years ago
4 0

Answer:

θ

can be in the first quadrant

0

≤

θ

≤

90

or the fourth quadrant

270

≤

θ

≤

360

If

θ

is in the first quadrant,

then

sin

θ

=

5

13

cos

θ

=

12

13

tan

θ

=

5

12

Therefore,

sin

2

θ

=

2

sin

θ

cos

θ

=

2

×

5

13

×

12

13

=

120

169

cos

2

θ

=

cos

2

θ

−

sin

2

θ

=

(

12

13

)

2

−

(

5

13

)

2

=

144

169

−

25

169

=

119

169

If

θ

is in the fourth quadrant,

then

sin

θ

=

−

5

13

cos

θ

=

12

13

tan

θ

=

−

5

12

Therefore,

sin

2

θ

=

2

sin

θ

cos

θ

=

2

×

−

5

13

×

12

13

=

−

120

169

cos

2

θ

=

cos

2

θ

−

sin

2

θ

=

(

12

13

)

2

−

(

−

5

13

)

2

=

144

169

−

25

169

=

119

169

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AysviL [449]

Answer:

<u>Question 1</u>

F

T

T

The volume of figure A can be found by multiplying (5 · 7)(2).

<u>Question 2</u>

T

T

F

The total volume of the figure is 442 mm³

<u>Question 3</u>

T

F

T

The volume of the triangular prism is 108 in³

Step-by-step explanation:

<u>Formula used</u>

Volume of a prism = base area × height

Area of a rectangle = width × length

Area of a triangle = 1/2 × base × height

Volume of a cube = s³  (where s is the side length)

---------------------------------------------------------------------------------------------------

<h3><u>Question 1</u></h3>

⇒ Volume of Figure A = (5 · 7)(2)

                                     = 70 cm³

⇒ Volume of Figure B = (13 · 7)(2)

                                     = 182 cm³

⇒ Total Volume = Volume of Figure A + Volume of Figure B

                           = 70 + 182

                           = 252 cm³

The first statement is false.

<u>Rewritten statement</u>:

The volume of figure A can be found by multiplying (5 · 7)(2).

---------------------------------------------------------------------------------------------------

<h3><u>Question 2</u></h3>

⇒ Volume of rectangular prism = (15 · 15)(2)

                                                    = 450 mm³

⇒ Volume of central cube = 2³

                                            = (2 · 2 · 2)

                                            = 8 mm³

⇒ Total Volume = Volume of rectangular prism - Volume of cube

                           = 450 - 8

                           = 442 mm³

The third statement is false.

<u>Rewritten statement</u>:

The total volume of the figure is 442 mm³

---------------------------------------------------------------------------------------------------

<h3><u>Question 3</u></h3>

⇒ Volume of rectangular prism = (12 · 3)(8)

                                                    = 288 in³

⇒ Volume of triangular prism = (1/2 · 12 · 6)(3)

                                                 = 108 in³

⇒ Total Volume = Volume of rectangular prism + Volume of triangular prism

                           = 288 + 108

                           = 396 in³

The second statement is false.

<u>Rewritten statement</u>:

The volume of the triangular prism is 108 in³

7 0
2 years ago
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