Question

It is given that sin30 = 0.5 and cos30 = 0.8666.
Write down value of
i) cos150
ii) cos60

Answer 1

a 150° lies in the second quadrant so cos 150° is negative. ... (cos 150°, sin 150°) as shown. ... POQ we can see that OQ = cos 30° and PQ = sin 30°, so the coordinates of P are −cos 30°,  .

Answer 2

Answer:

i) cos150

cos (180⁰-30⁰)

cos (-30)

- cos30⁰

- 0.8666

ii) cos60⁰

cos60⁰=sin30⁰

cos60⁰ = 0.5

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