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2 years ago

5 screen shots plz help plz will choose brianyest and will give 19 pts

Mathematics

1 answer:

Taya2010 [7]2 years ago

7 0

Tigers! Have a great day!

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Please someone help me. It's about proving related to transformation of trigonometric ratios. Thank you!!

kvasek [131]

Answer:

see explanation

Step-by-step explanation:

Using sum to product identities

cos x - cos y = - 2sin( $\frac{x+y}{2}$ )sin( $\frac{x-y}{2}$ ) = 2sin( $\frac{x+y}{2}$ )sin( $\frac{y-x}{2}$ )

cos x + cos y = 2cos( $\frac{x+y}{2}$ )cos( $\frac{x-y}{2}$ )

Note that

sin10° = sin(90 - 10)° = cos80°

Thus

$\frac{2sin(\frac{10+80}{2})sin(\frac{80-10}{2}) }{2cos(\frac{10+80}{2})cos(\frac{80-10}{2}) }$ ← cancel 2 from numerator/ denominator

= $\frac{sin45}{cos45}$ × $\frac{sin35}{cos35}$

= tan45° × tan35° { tan45° = 1 ]

= 1 × tan35°

= tan35° ← as required

5 0

3 years ago

Read 2 more answers

2.4m log is cut into lengths into the ratio 7 : 5. Find the longer length in cm.

sergeinik [125]

Answer:

140 centimeters.

Step-by-step explanation:

Hello!

A 2.4 meter log is split into the ratio 7:5. Each unit part is one x-increment, so the log is split into 7 x-increments and 5 x-increments.

Find the longer length:

2.4 into 7:5
2.4 = 7x + 5x
2.4 = 12x
x = 2.4/12
x = 0.2

Now, we must find the longer length, 7x.

7x
7(0.2)
1.4

The longer length is 1.4 meters, but we want it in cm.

There are 100 centimeters in a meter.

1.4 meters = 1.4 * 100
1.4 meters = 140 centimeters

The longer length is 140 centimeters.

7 0

1 year ago

PLEASE HELP!!

QveST [7]

Just add up all the numbers

7 0

2 years ago

An ordinary Fair die is a cube with the numbers 1 through 6 on the sides represented by painted spots imagine that such a die is

Hoochie [10]

Answer: Probability of, Event A = 5/18

Event B = 1/2

Step-by-step explanation:

Since, The probability of an event = Number of outcomes of the event/ total number of outcomes.

Since, If a fair dire rolled two times then the total number of outcomes, n(S) = 6 × 6 = 36

And, Event A: The sum is greater than 8.

So, possible outcomes are, ( 3,6), (4,5), (4,6), (5,5), (5,6), (5,4), (6,6), (6,5), (6,4), (6,3)

Thus, n(A) = 10

Since, Probability of event A,

P(A) = n(A)/n(S) = 10/36 = 5/18

Therefore, P(A)= 5/18

Now, Event B: The sum is an even number.

So, possible outcomes are, (1,1),(1,3), (1,5), (2,2), (2,4), (2,6), (3,1), (3,3), (3,5), (4,6), (4,2), (4,4), (5,1), (5,3), (5,5), (6,2), (6,4), (6,6)

Thus, n(B)= 18

Since, Probability of event B,

P(B)= n(B)/n(S) = 18/36 = 1/2

Therefore, P(B)= 1/2

7 0

2 years ago

What does 1/9-(-2/5-8/9) equal?

babunello [35]

1/9 - (-2/5 - 8/9) = 1/9 + 2/5 + 8/9 = 1 + 2/5 = 7/5 or 1 2/5

6 0

3 years ago