TRIGNOMETRICAL IDENTITIES :10th ICSE (CONCISE MATHEMATICS) Examples Part - II (part 2)

10th ICSE (CONCISE MATHEMATICS) : TRIGNOMETRICAL IDENTITIES (Examples Part - II (part-2))

This video explains the examples of chapter Trignometrical identities in Maths Concise (Selina)

First of all, the three sides of right angles triangle has been explained
Side opposite to 90° is known as Hypotenuse
Side having both the angles (θ and 90° is known as Base(Adjacent)
Side opposite to angle (θ ) is known as Perpendicular (Opposite)

This

Sinθ = Perpendicular (Opposite)/ Hypotenuse
Cosθ = Base (Adjacent / Hypotenuse
Tanθ = Perpendicular (Opposite)/ Base (Adjacent)

Then three trigonometrical identities have been explained

sin^2θ +cos^2θ = 1
sec^2θ - tan ^2θ =1
cosec^2θ -cot^2θ =1


Also tanθ = sinθ/ cosθ, tanθ = 1/cotθ, cotθ = cosθ/ sinθ,
sinθ = 1/ cosecθ, cosθ = 1/ secθ

Then STEPS ( tricks) to solve these identities have been explained
STEPS
1) Convert into
sin & cos form

2) Take LCM

3) Apply Identity


After all the above explanation, how to solve the following examples have been explained

Example 3) (ii) 1+cosA/1-cosA = (cosecA + cotA)^2

(Solving RHS)

(iii) cotA +tanB/cotB +tanA =cotA.tanB

(iv) cosA.cotA/1-sinA = 1+cosecA

#trigonometry #10ICSE #10CBSE #transelearning #concise #mathematics #trignometrical #identities


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