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RD Chapter 6 Trigonometric Identities Ex 6.1 Solutions

Question - 81 : - If cos θ + cos2  θ = 1,prove that
sin12 θ + 3 sin10  θ + 3 sin8  θ+ sin6  θ + 2 sin4  θ + 2 sin2  θ-2= 1

Answer - 81 : -


Question - 82 : - Given that :
(1 + cos α) (1 + cos β) (1 + cos γ) =(1 – cos α) (l – cos β) (1 – cos γ)
Show that one of the values of eachmember of this equality is sin α sin β sin γ

Answer - 82 : -


Question - 83 : -

Answer - 83 : -


Question - 84 : -

Answer - 84 : -


Question - 85 : - If sin θ + 2cos θ = 1 prove that 2sin θ – cos θ = 2. [NCERT Exemplar]

Answer - 85 : -


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