Find the value of cos 75º
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Answer:
Step-by-step explanation:
Apply the trig identity: cos (a + b) = cosA.cosB - sinA.sinB
That is,
Cos (75) = cos (30+45) = cos30.cos45 - sin30.sin45
= (√3/2) (√2/2) - (1/2) (√2/2)
= (√6-√2)/4
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