3 years ago

Please help me Idk this

Mathematics

2 answers:

disa [49]3 years ago

8 0

Answer:

The answer is most likely 178

Step-by-step explanation:

Basically I was taught to do this by adding the three angles of the triangle if the answer was over 180 you'd subtract 180 from it but they add up to be a simple 178

Hope I was able to help!

AURORKA [14]3 years ago

4 0

Answer: I say it is 36

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VikaD [51]

Not sure why such an old question is showing up on my feed...

Anyway, let $x=\tan^{-1}\dfrac43$ and $y=\sin^{-1}\dfrac35$ . Then we want to find the exact value of $\cos(x-y)$ .

Use the angle difference identity:

$\cos(x-y)=\cos x\cos y+\sin x\sin y$

and right away we find $\sin y=\dfrac35$ . By the Pythagorean theorem, we also find $\cos y=\dfrac45$ . (Actually, this could potentially be negative, but let's assume all angles are in the first quadrant for convenience.)

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