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f'(0) = ? for an even function f that is differentiable at 0

Since f is differentiable at 0 we have,

limh0f(0+h)f(0)h=limh0f(0h)f(0)h

limh0f(h)f(0)h=limh0f(h)f(0)h

Since f is an even function, f(-h) = f(h) Continue reading f'(0) = ? for an even function f that is differentiable at 0

3cos2x+2sinx+1

(3cos2x+2sinx+1)max=?

The given expression = 3sin2x+2sinx+4

= – [(3sinx)22.13.3sinx+1313] + 4

=[(3sinx13)213]+4 Continue reading 3cos2x+2sinx+1