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What degree is cos α equal to 0.8
cosα=0.8=4/5
Therefore, α is a 30 ° angle
Why is cos α - 4sin α = 0 and Tan α equal to one fourth
cosα=4sinα
So tan α = sin α / cos α = 1 / 4
|If x | is less than or equal to π / 4, and min of F (x) = (COS ^ 2) x-acosx is - 1 / 4, find the value of A
Classified discussion
Y = (cosx-a / 2) ^ 2-A ^ 2 / 4 because x | is less than or equal to π / 4 radical 2 / 2
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