Math, asked by pushpabhandari2016, 8 months ago

a) If cos2A =11/25
show that cosA=6/5√2

Answers

Answered by challaharsha680

2

Answer:

we know that cos2A = 2cos^2A-1

Step-by-step explanation:

substitue this cos2A =11/25

11/25 = 2cos^2A-1

cos^2A= 36/50

cosA=6/5√2

hence proved

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