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Q10 B of 113 Page 526

Prove that

To prove:

Taking LHS,

Putting π = 180°

= sin 30° cos 0° + sin 45° cos 45° + sin 60° cos 30°

Now, we know that,

Putting the values, we get

= RHS

∴ LHS = RHS

Hence Proved

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Find the value of

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(iv) sec ( - 420⁰)

(v) cosec ( - 690⁰)

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(vii) cot ( - 315⁰)

(viii) sin ( - 1230⁰)

(ix) cos (495⁰)