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Which of the following values is not defined?
The value of cot 0˚ is not defined.
Find the value of
cos 0˚ = 1 and sin 90˚ = 1; hence,
If cos3A = sin (2A + 30˚) where 3A is an acute angle, then find the value of A.
cos 3A = sin (2A + 30˚)
cos 3A = cos [90˚ − (2A + 30˚)]
cos 3A = cos (90˚ − 2A − 30˚)
3A = 60˚ − 2A
5A = 60˚
A = 12˚
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