If sin (7 0 +9°) = cos 20, find a value of 0.
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Step-by-step explanation:
If tanθ=1 and sinϕ=1 / √2
, then the value of cos(θ+ϕ) is
The values of θ satisfying sin7θ=sin4θ−sinθ and 0<θ<2π
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