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alpha,beta,gammaa n ddelta are angle in ...

`alpha,beta,gammaa n ddelta` are angle in I, II, III and iv quadrants, respectively and none of them is an integral multiple of `pi/2dot` They form an increasing arithmetic progression. Which of the following holds? `cos(alpha+delta)>0` `cos(alpha+delta)=0` `cos(alpha+delta)<0` `cos(alpha+delta)>0orcos(alpha+delta)<0` Which of the following does not hold? `sin(beta+gamma)=sin(alpha+delta)` `sin(beta-gamma)="sin"(alpha-delta)` `sin(alpha-beta)="tan"(beta-delta)` `sin(alpha+gamma)=cos2beta)` If `alpha+beta+gamma+delta=thetaa n dalpha=70^0,` then `400^0

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