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Viktor [21]
2 years ago
15

I'm desperate, and need help, this stuff has me stuck​

Mathematics
1 answer:
Oksi-84 [34.3K]2 years ago
3 0

Answer:

its C

Step-by-step explanation:

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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
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Evaluate the function<br> f(x) = - 2x^2 + 2x + 4<br> Find f(1)
AlekseyPX

Answer:

f(1) = 4

Step-by-step explanation:

f(x) = - 2x^2 + 2x + 4

f(1) = - 2(1)^2 + 2(1) + 4

f(1) = -2 + 2 + 4

f(1) = 4

6 0
2 years ago
I REALLY NEED HELP!!! PLEEEEEASE
algol [13]

Answer:

I think its 4.

Step-by-step explanation:

4 0
2 years ago
Graph the linear equation 3x - y = 12. Write the equation in slope-intercept form,
S_A_V [24]

Answer: y=3x-12

Step-by-step explanation:

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2 years ago
In his pocket , a boy has 3 red marbles, 4 blue marbles , and 4 green marbles. how many will he have to take out of his pocket t
Ira Lisetskai [31]
9 before he can be sure he has a red one
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3 years ago
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