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Question

Calculate the value of cos(605).

A
0.498
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B
0.497
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C
0.496
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D
0.948
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Solution

The correct option is D 0.498
cos(605)
=cos(60+5)
Using compound angle formula,cos(A+B)=cosAcosBsinAsinB
=cos60cos5sin60sin5
=12×cos56032×sin560
=12×cos0.083332×sin0.0833
=0.5×0.9999980.866×0.00145=0.4999990.00125570.4987

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