Trigonometric Identity help

Mathematics

1 answer:

vovikov84 [41]4 years ago

7 0

Answer:

sin $\pi$ /4 * sin $\pi$ /6 = 1/2 *(cos $\pi$ /12 - cos 5 $\pi$ /12)

Step-by-step explanation:

Formula:- sinX sinY = (1/2) [ cos (X - Y) - cos (X + Y) ]

sin(π/4)sin(π/6)

= (1/2)[cos(π/4 - π/6) - cos(π/4 + π/6)]

= (1/2)[cos(3π/12 - 2π/12) - cos(3π/12 + 2π/12)]

= (1/2)[cos(π/12) - cos(5π/12)]

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Charra [1.4K]

Answer:

d. 0.0948 ± 4.032(0.0279)

Step-by-step explanation:

A 99% confidence interval for the coefficient of promotional expenditures is, First, compute the t critical value then find confidence interval.

The t critical value for the 99% confidence interval is,

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3 years ago

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Svetllana [295]

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