Q1 of 80 Page 311

If then let us show that

Given,


⇒ sec2θ = 1 + tan2θ


⇒


=


=


⇒


⇒


⇒


⇒


⇒ cos θ =


⇒ sin2θ + cos2θ = 1


⇒


=


=


⇒


⇒


=


=


=


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11

Let us determine the value/value of for which 2 cos2 θ – 3 cos θ + 1 = 0 will be true.

 1

If then let us write the value of by determining it.

 1

If tan θ=1, then let us determine the value of

2

i. Let us express cosec θ and tan θ in term of sin θ.

ii. Let us write cosec θ and tan θ in term cos θ.