Question

Find the value of sin (-405°)

Answer 1

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Answer 2

Answer:

sin (-405°) = -1/√2

Step-by-step explanation:

To find the value of sin (-405°)

as we know that period of sine is 2π

so write 405° in terma of sin[-(360+45)]

sin[-(360+45)] =sin(-45°)

as sin(-θ)= -sin θ

so

=> -sin(45°)

=> -1/√2

sin (-405°)=-1/√2