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Question

The value of cos520+cos68+cos1720, is

A
0
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B
1
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C
2
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D
None of these
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Solution

The correct option is A 0
cos52+cos68+cos172
cos52+2cos(68+1722)cos(172682) [cosC+cosD=2cos(C+D2)cos(CD2)]
cos52+2cos(120)cos(1042)
cos52[1+2cos(120)]
cos52[1+2cos(18060)]
cos52[12cos60]
cos2[12(12)]
0
cos52+cos68+cos172=0

1191055_1306559_ans_bbecceebb2964bf1a86f6da63d6e3614.jpeg

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