The angle α, measured in radians, satisfies the inequalities π≤α≤3/2π. Beräkna sin α, om man vet att cos α=−(3/4). Sin α = ?

Question

The angle α, measured in radians, satisfies the inequalities π≤α≤3/2π. Beräkna  sin α, om man vet att  cos α=−(3/4). Sin α = ?

Yefim S. · Accepted Answer

sinα = - √(1 - 9/16) = - √7/4

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