Asked by John

Find all x such that 0< = x <= pi/2 and sin^7 x + cos^7 x = 1. (Be sure to show that no other values of x satisfy the equation. Remember, x is in radians.)

I'm confused. I posted this before but my thick skull couldn't absorb the answer I was given. Could someone help?
Answered by bobpursley
That example used calculus. Is that what you did not understand?
Answered by John
Yes sir, this is supposed to be a precalculus problem. Thanks
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