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Trigonometry

Prasannakumar Kalahasthi

11/03/2020 0 0

S i n θ = \frac{p e r p e n d i c u l a r}{h y p o t e n u s e} = \frac{y}{r}

C o s θ = \frac{b a s e}{h y p o t e n u s e} = \frac{x}{r}

T a n θ = \frac{p e r p e n d i c u l a r}{b a s e} = \frac{y}{x} = \frac{S i n θ}{C o s θ}

C o t θ = \frac{b a s e}{p e r p e n d i c u l a r} = \frac{x}{y} = \frac{C o s θ}{S i n θ}

S e c θ = \frac{h y p o t e n u s e}{b a s e} = \frac{r}{x} = \frac{1}{C o s θ}

C o \sec θ = \frac{h y p o t e n u s e}{p e r p e n d i c u l a r} = \frac{r}{y} = \frac{1}{S i n θ}

7) Signs of trigonometric ratios
I QUADRANT:

A

means all trigonometric ratios are positive.
II QUADRANT:

S

means

S i n

and

C o \sec

are positive and all others are negative.
III QUADRANT:

T

means

T a n

and

C o t

are positive and all others are negative.
IV QUADRANT:

C

means

C o s

and

S e c

are positive and all others are negative.

ASTC - All Silver Tea Cups

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