¥¥¥¥10 mathematics unit 8.4 solutions

Geometry formula Downloa

Trigonometry 8.4

Question no 5 ) vi

Question no 5) v

Question vii

Question no 5(viii)

Question no 5 (ix)

Question no 5 (x)

Exercise 9. 1 all solution pdf format

basic concepts

question no 3

Trigonometric Sign Functions

sin (-θ) = − sin θ

cos (−θ) = cos θ

tan (−θ) = − tan θ

cosec (−θ) = − cosec θ

sec (−θ) = sec θ

cot (−θ) = − cot θ

Trigonometric Identities

sin2A + cos2A = 1

tan2A + 1 = sec2A

cot2A + 1 = cosec2A

Periodic Identities

sin(2nπ + θ ) = sin θ

cos(2nπ + θ ) = cos θ

tan(2nπ + θ ) = tan θ

cot(2nπ + θ ) = cot θ

sec(2nπ + θ ) = sec θ

cosec(2nπ + θ ) = cosec θ

Complementary Ratios

Quadrant I


sin(π/2 − θ) = cos θ

cos(π/2 − θ) = sin θ

tan(π/2 − θ) = cot θ

cot(π/2 − θ) = tan θ

sec(π/2 − θ) = cosec θ

cosec(π/2 − θ) = sec θ

Quadrant II


sin(π − θ) = sin θ

cos(π − θ) = -cos θ

tan(π − θ) = -tan θ

cot(π − θ) = – cot θ

sec(π − θ) = -sec θ

cosec(π − θ) = cosec θ

Quadrant III


sin(π + θ) = – sin θ

cos(π + θ) = – cos θ

tan(π + θ) = tan θ

cot(π + θ) = cot θ

sec(π + θ) = -sec θ

cosec(π + θ) = -cosec θ

Quadrant IV


sin(2π − θ) = – sin θ

cos(2π − θ) = cos θ

tan(2π − θ) = – tan θ

cot(2π − θ) = – cot θ

sec(2π − θ) = sec θ

cosec(2π − θ) = -cosec θ

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