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Question

Values of cos1cos13π2+tan1tan13π5+sec1sec13π3+cot1cot17π2+sin1sin33π5 is

A
23π5
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B
11π5
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C
4π3
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D
5π6
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Solution

The correct option is C 4π3
cos1cos13π2=π2
tan1tan13π5=13π53π
sec1sec13π3=13π34π
cot1cot17π2=π2
sin1sin33π5=7π33π5
Sum=π2+π2+π3=4π3

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