find the value of A if cos3A+sin3A is maximum
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Answer:
1
Step-by-step explanation:
cos3A+Sin3A..........(1)
cos3A=4cos³A-3cosA
sin3A=3sinA-4sin³A
put in equation (1)
=4cos³A-3cosA+3sinA-4sin³A
=cos²A+sin²A
=1
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