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alpha, beta,gamma, delta are angles in ...

`alpha, beta,gamma, delta` are angles in I, II, III and IV quadrant respectively and no one of them is an integral multiple of `pi//2`- They form an increasing arithmetic progression.
Which of the following holds:

A

`cos(alpha + delta) gt 0`

B

`cos(alpha + delta)=0`

C

`cos(alpha + delta) lt 0`

D

data is sufficient

Text Solution

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The correct Answer is:
A
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