3 years ago

Need some help with this question please

Mathematics

1 answer:

katrin [286]3 years ago

8 0

Answer:

cos(θ) = -3/5

Step-by-step explanation:

The cosine of the reference angle (in the first quadrant) is ...

cos(θ) = √(1 -sin(θ)²) = √(1 -(4/5)²) = √(1 -16/25) = √((25-16)/25)

= √(9/25) = 3/5 . . . . in the first quadrant

In the second quadrant, the cosine is negative, so the answer is ...

cos(θ) = -3/5

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