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Q.

If sinx + cosx = a then sinx-cosx =

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a

1-a2

b

a2-1

c

2-a2

d

a2-2

answer is C.

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Detailed Solution

                                        sinx + cosx = a sinx-cosx=b (sinx+cosx)2+(sinx-cosx)2=a2+b2 1+2 sinx cosx+1-2 sinx cosx=a2+b2 b2=1-a2b=2-a2  sinx-cosx=2-a2

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