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1)IF sinx=cos 2 x, then cos 2 x(1 + cos 2 x) is? 2)SOLUTION SET OF (3/5) x =(x -x 2 -9) is?

1)IF sinx=cos2x, then cos2x(1 + cos2x) is?


2)SOLUTION SET OF (3/5)x=(x -x2-9) is?

Grade:11

1 Answers

Badiuddin askIITians.ismu Expert
148 Points
12 years ago

Dear vardaan

sinx=cos2x

sinx =1-sin2x

sin2x = 1-sinx  ..............1

 

now   cos2x(1 + cos2x) = sinx (1+sinx)

                                            =sinx + sin2x

                                            = sinx + 1-sinx         from equation (1)

                                             =1

 

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