namaalajmi7 namaalajmi7

21-09-2021
Mathematics

contestada

What is the value of cos 30° cos 90° - sin 30° sin 90°

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allianaeacepaws allianaeacepaws

21-09-2021

Answer:

--1/2 or -0.5

Step-by-step explanation:

Answer Link

Аноним Аноним

21-09-2021

Step-by-step explanation:

cos 30° cos 90° - sin 30° sin 90°

cos 30° = √3/2

cos 90°=0

sin30°= ½

sin 90°=1

= √3/2(0) -½(1)

=-½

Answer Link

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