sign change when angle more than 90+ (Question:671894.0) :: Toprankers

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A RaTheE

· started a discussion

· 1 Months ago

sign change when angle more than 90+ (Question:671894.0)

cos(150)=cos(90+60) than it becomes -sin60

none of the options is right

Question:

What is the value of $\frac{4}{3} c o t^{2} (\frac{π}{6}) + 3 c o s^{2} (150 º) - 4 c o s e c^{2} 45 º + 8 s i n (\frac{π}{2})$ ?

Options:

A)

$\frac{25}{4}$

B)

$\frac{- 25}{4}$

C)

1

D)

$\frac{4}{25}$

Solution:

Ans: (a)

dinesh malik

· commented

· 1 Months ago

Yet to be approved!

Gunjit Neekhra

· commented

· 1 Months ago

Yet to be approved!

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