principle value of sin (-135°) is
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θ° θradians sin(θ)
135° 3π/4 √2/2
150° 5π/6 1/2
180° π 0
210° 7π/6 -1/2
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Answer:
sin(-135°)
= -sin(135°)
= sin( 45° - 180° )
= sin( -45°) = -1/√2
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