3 years ago

Evaluate the expression when g = 6 and h = 7 h + 9g

Mathematics

2 answers:

Norma-Jean [14]3 years ago

4 0

Sub the numbers in
7 + 9(6)
=7 + 54
=61

SVEN [57.7K]3 years ago

4 0

Answer:

inserting value of g = 6 and h = 7

7 + (9 × 6)

or. 7 + 54

or. 61

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How did he get this 1/2i ? I dont remember studying this definition in calc 1 neither calc 2!

Hitman42 [59]

The $i$ in the denominator is missing in the second expression. It should be

$\sin at=\dfrac{e^{iat}-e^{-iat}}{2i}$

This follows from

$e^{iat}=\cos at+i\sin at$
$e^{-iat}=\cos at-i\sin at$
$\implies e^{iat}-e^{-iat}=2i\sin at$
$\implies \sin at=\dfrac{e^{iat}-e^{-iat}}{2i}$