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12-12-2019
Mathematics

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If sin 18° = 0.3090,cos 18° = 0.9511, sin 22° = 0.3746, and
cos 22° = 0.9272, then what is sin 40°?

Respuesta :

jimrgrant1 jimrgrant1

12-12-2019

Answer:

0.6428

Step-by-step explanation:

Using the addition formula for sine

sin(x + y) = sinxcosy + cosxsiny

Hence

sin40 = sin(18 + 22)

= sin18cos22 + cos18sin22

= (0.3090 × 0.9272) + (0.9511 × 0.3746)

= 0.2865 + 0.3563

= 0.6428

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