3 years ago

Sin78 ×cos42+cos78×sin42 evaluate without the use of a calculator

1 answer:

4 0

Sin a * cos b + cos a * sin b=sin (a+b)

sin 78 * cos 42 + cos 78* sin 42=sin (78+42)=sin 120=sin(180-120)=
sin 60=√3 / 2

Answer: sin 78 * cos 42 + cos 78* sin 42=<span>√3 / 2</span>

You might be interested in

What is found on the y axis of a velocity time graph?

jeyben [28]

Answer:The Y axis of a velocity time graph represents the instateneous velocity of a particle or body

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

Identify the relationship between 4 and 5

olganol [36]

Answer:

Alternate interior angles

Step-by-step explanation:

5 0

3 years ago

GH has a midpoint at M (5,9). Point H is at (8,9). Find the coordinates of point G

natta225 [31]

Answer:

(2,9)

Step-by-step explanation:

The midpoint of a point is halfway between two points. The distance between the midpoint and point H is 3 because the distance from 5 to 8 is 3. Therefore 3 away from 5 would be 2.

7 0

3 years ago

Can someone help plz im giving brain

kenny6666 [7]

Answer:

for 20 the answer is B

Step-by-step explanation:

8 0

3 years ago

(05.06 LC) A person drives her own personal vehicle to work two days of the week. Her commute to and from work is 42 miles a day

Inessa05 [86]

Answer:

1.5 gallon per day

Step-by-step explanation:

As given,

Daily miles = 42

Average gasoline used = 28 mil/gallon

Daily use of gasoline = $\frac{Daily mile}{Average gasoline}$

= $\frac{42}{28}$ = 1.5 gallon /day

∴ we get

she conserve gasoline a day = 1.5 gallon per day

4 0

3 years ago