Question

If secA×sinA = 0
then find the value of cos A ​

Answer 1

ǫᴜᴇsᴛɪᴏɴ →

If secA×sinA = 0

then find the value of cos A

ᴀɴsᴡᴇʀ →

$\longmapsto\tt{secA(sinA) = 0}$

$\longmapsto\tt{(\dfrac{1}{cosA})(sinA) = 0}$

$\longmapsto\tt{tanA=0 }$

Therefore A is in 1st or 3rd Quadranti.

$\longmapsto\tt{A=0 \: Degrees, 180 \: Degrees....}$

$\tt\boxed{This \: yields \: cosA \: = \: 1 \: or \: cosA \: = \: -1}$