If sec A =5/3, verify that 4cos cube A - 3cos A /3sin A - 4sin cube A
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Step-by-step explanation:
sec a = 5/3
cos a = 3/5
cos³a = 27/125
sin a = 4/ 5
sin³a = 64/125
putting in the question
4 × 27/125 - 3 × 3/5
---------------------‐-----------
3 × 4/5 - 4 × 64/125
108 - 225 / 125
-------------------------
300 - 256 /125
-117 / 74
answer
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