Question

Given that cos(A+B)=cosAcosB-sinAsinB.Find the value of cos105°

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Answer 1

Answer:

The answer is 1-√3/2√2

Step-by-step explanation:

• cos105 = cos(60+45)
• =cos60 cos45 - sin 60 sin 45
• = 1/2 ×1/√2 -√3/2 ×1/√2
• =1-√3/2√2

Answer 2

step by step is done ........