Trigonometry Answers

P/t 〖Cos〗^(4 ) π/8+〖Cos〗^(4 ) 3π/8+〖Cos〗^4 5π/8+〖Cos〗^4 7π/8 =3π/2

P/t (cos6θ+6cos4θ+15cos2θ+10)/(cos5θ+5cos3θ+10cosθ)=2cosθ

P/t tan20 tan40 tan80 = tan60

P/t Sin 25°Cos115°=1/2(Sin40°-1)

if α+β = 90° find the maximum and minimum values of sinα.sinβ

prove that SinA Sin(60-A)Sin(60+A)=¼Sin3A

if α+β = 90° find the maximum and minimum values of sinα.sinβ
P/t Sin 25°Cos115°=1/2(Sin40°-1)
P/t tan20 tan40 tan80 = tan60
If Sinθ+Sinɸ=√3(Cosɸ-Cosθ),p/t Sin3θ+Sinɸ=0
If √3 cosec20°-sec20°=4

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find the amplitude, period of the function and sketch its graph
1. y = cos2x
2. y= -3sin3x
3. y= 5cos(3x-pie/4)