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alekssr [168]
3 years ago
9

Sin( X+Y ) = cos( X−Y ) = 1, find the value of X and Y.

Mathematics
1 answer:
iris [78.8K]3 years ago
7 0

answer x = 225 and y = -135

Step-by-step explanation:

x+y = 90 and x= 90-y and x -y = 360 so 90-y -y = 360

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I NEED HELP PLEASE, THANKS! :)
NISA [10]

Answer:   \bold{b)\quad \dfrac{2\pi}{3},\dfrac{4\pi}{3},0}

<u>Step-by-step explanation:</u>

Note the following identities: tan² x = sec²x - 1

                                                 \sec x=\dfrac{1}{\cos}

tan² x + sec x = 1

(sec² x -1) + sec x = 1

sec² x + sec x - 2 = 0

(sec x + 2)(sec x - 1) = 0

sec x + 2 = 0     sec x - 1 = 0

sec x = -2          sec x = 1

\dfrac{1}{\cos x}=-2\qquad \dfrac{1}{\cos x}=1\\\\\cos x=-\dfrac{1}{2}\qquad \cos x=1\\\\x=\dfrac{2\pi}{3}, \dfrac{4\pi}{3}\qquad x=0

8 0
3 years ago
Read 2 more answers
What number is 25% of 400 please show work thank you
ANEK [815]

Answer:

100

Step-by-step explanation:

well, you can just use a calculator, or your mind if that's possible, to solve this.

at least, what i think you're asking.

400 × 0.25 = 100.

this one is extra easy because you should know that 25% is a quarter, and 400 can just be divided by 4 to get your answer.

6 0
2 years ago
Draw the polygon with the given vertices in a coordinate plane.(2,2),(3,712),(8,712),(10,4),(7,0)
Ne4ueva [31]

Answer:

can u give us an online platform to draw it

Step-by-step explanation:

3 0
3 years ago
Jonathan cannot afford to pay cash for the cellphone in the Callnow shop. He can only afford to pay R400 per month. Determine th
inessss [21]

Answer:

9 months

Step-by-step explanation:

Becase in 8 months he can pay 3200 but another month also need to pay ramining money

5 0
2 years ago
Evaluate the following expression using the values given:
abruzzese [7]
-a^2 - 3b^3 + c^2 + 2b^3 - c^2 = -a^2 - b^3 = -(3)^2 - (2)^3 = -(9) - 8 = -9 - 8 = -17
3 0
3 years ago
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