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2 years ago

Halp me please i don't wanna fail...I wanna pass this test ;--; (MUST BE A EXPRESSION)

Mathematics

2 answers:

vaieri [72.5K]2 years ago

6 0

Answer:

155+27n

Step-by-step explanation:

hope this helps

RSB [31]2 years ago

4 0

Answer:

142 I hope that helpes

Step-by-step explanation:

30+15= 45 and 85+12= 97 45+97= 142

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Ierofanga [76]

Given:

The given expression is:

$\dfrac{3\sin a-4\sin 4a}{\sin 5a}$

To find:

The value of the given expression at $a=-45$ .

Solution:

We have,

$\dfrac{3\sin a-4\sin 4a}{\sin 5a}$

Substituting $a=-45$ , we get

$\dfrac{3\sin (-45)-4\sin [4(-45)]}{\sin [5(-45)]}$

$=\dfrac{-3\sin (45)+4\sin (180)}{-\sin (225)}$

$=\dfrac{-3\sin (45)+4\sin (180)}{-\sin (180+45)}$

$=\dfrac{-3\sin (45)+4\sin (180)}{\sin (45)}$

On substituting $\sin (180)$ , we get,

$=\dfrac{-3\sin (45)+4(0)}{\sin (45)}$

$=\dfrac{-3\sin (45)+0}{\sin (45)}$

$=\dfrac{-3\sin (45)}{\sin (45)}$

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