Ooh easy trigo frigo

Geometry Level 1

Given that

c o s 2 θ = 1 cos2 \theta = 1

Find

s i n θ sin\theta

0 ≤ θ ≤ π / 2 0\leq\theta\leq\pi/2


The answer is 0.

Kritarth Lohomi by kritarth lohomi , 18, India

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3 solutions

Kritarth Lohomi
Jan 19, 2015

c o s 2 θ = 1 cos2\theta= 1

So

θ = 0 ° \theta =0°

s i n θ = s i n ( 0 ° ) = 0 sin\theta = sin(0°) = 0

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kritarth lohomi - 6 years, 4 months ago

θ c a n a l s o b e 18 0 o \theta ~ can ~also~ be~ 180^o . with the same result. .But it is given that 0 ≤ θ ≤ π / 2 0\leq\theta\leq\pi/2 . Just a note.

Niranjan Khanderia - 6 years, 4 months ago
Ebtihal Mohamed
Jan 19, 2015

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Ahmed Mokhtar
Jan 19, 2015

cos 2θ = 1 So 2θ=0 θ=0°

Sin (0°)= 0

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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