Q.

If cos-1p+cos-11-p+cos-11-q=3π4, then the value of q is

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a

12

b

1

c

12

d

13

answer is D.

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Detailed Solution

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cos-1p+cos-11-p2+cos-11-q=3π4 cos-1p+sin-1 p+cos-11-q=3π4 π2+cos-11-q=3π4

cos-11-q=3π4-π2=π4 1-q=cosπ41-q=12 1-q=12q=12

q=12

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