The value of cos(270^@+theta)cos(90^@+th...

The value of `cos(270^@+theta)cos(90^@+theta)-sin(270^@-theta)costheta` is.................. A) `0` B) `-1` C) `1/2` D) `1`

A

0

B

`-1`

C

`1/2`

D

1

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The correct Answer is:

D

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