Q10 C of 113 Page 526

Prove that


To prove:

Taking LHS,



Putting π = 180°



= 4 sin 30° sin2 60° + 3 cos 60° tan 45° + cosec2 90°


Now, we know that,





tan 45° = 1


cosec 90° = 1


Putting the values, we get






= 4


= RHS


∴ LHS = RHS


Hence Proved


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Find the value of

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(v) cosec ( - 6900)


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Find the values of all trigonometric functions of 1350