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Home Q & A Board Science-Related Homework Help Mathematics
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hellohi hellohi
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12 years ago Edited: 6 years ago, duddy
State a trigonometric ratio that is equivalent to each of the following trigonometric ratios: sin 3pi/10, -cos8pi/7

and y=-5sin(x-pi/2)-8 using the cosine function, write an equation that is equvalent to this.

Thanks Foadbear, while you answer my questions Ill do some of the rest on my own. THANKS AGAIN.
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#1
Valued Member
12 years ago
Quote from: hellohi (12 years ago)
State a trigonometric ratio that is equivalent to each of the following trigonometric ratios: sin 3pi/10, -cos8pi/7

and y=-5sin(x-pi/2)-8 using the cosine function, write an equation that is equvalent to this.

Thanks Foadbear, while you answer my questions Ill do some of the rest on my own. THANKS AGAIN.

sin 3pi/10 = sin (pi - 3pi/10) = sin 7pi/10

-cos 8pi/7 = sin (3pi/2 + 8pi/7) = sin 37pi/14 = sin 9pi/14

sin(x+3?/2)
= sinxcos3?/2 + sin3?/2cosx
= sinx*0 + -1*cosx
= -cosx            using this


I hope you can now solve the last part yourself.
I don't feel like riding until everything blurs.

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