1.

alpha, beta,gamma, deltaare 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:

Answer»

`cos(alpha + DELTA) GT 0`
`cos(alpha + delta)=0`
`cos(alpha + delta) lt 0`
DATA is sufficient

ANSWER :A


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