Question

ERROR ANALYSIS need answer in a least a hour or so please help,what is the error​

Answer 1

Explanation:

1) Sin² Ф = 1 - cos² Ф

So, 1 - Sin² Ф = 1 - (1 - cos² Ф)

= 1 - 1 + cos² Ф = cos² Ф

2) tan x = Sin x /Cos x

tan x * csc x = Sin x /Cos x * 1/Sin x = Sinx * 1 / cos x * sin x

=1/cos x = Sec x