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Consider a triangle PQR ,right at R ,in ...

Consider a triangle PQR ,right at R ,in which PQ = 29 units ,QR =21 units and ` angle PQR =theta ,`then find the values of
(i) ` cos ^(2) theta + sin ^(2) theta and (ii) cos ^(2) theta -sin ^(2) theta `

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BEYOND PUBLICATION-TRIGONOMETRY-EXERCISE
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  4. If cos A =(12)/( 13), then find sin A and tan A ( A lt 90 ^(@))

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  5. If 12 tan A = 5, then find sin A and cos A.

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  6. If 15 cot A = 8, find sin A and sec A.

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  7. If angle A and angle P are acute angles such that sin A =sin P then ...

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  8. If (2 sin theta )/(1+ cos theta + sin theta )=x, find the value of (1...

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  9. If sin theta = a/b, find sec theta + tan theta in terms of a and b.

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  10. If 3 cot A = 4, check whether (1 - tan^2 A)/(1 + tan^2 A) = cos^2 A - ...

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  11. Evaluate the following: tan 45^@. Cos 30^@. Cosec 60^@.

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  12. Evaluate the following: tan^2 60^@ + cot^2 45^@ - sin 30^@

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  13. Evaluate the following: sin 30^@ + cos^2 30^@ - cot^2 45^@.

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  14. cos 0^(0) + sin 90^(0) + sqrt 2 sin 45^(0)విలువ

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  15. Evaluate the following: tan^2 60^@ + 2 tan^2 45^@.

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  16. Evaluate the following: tan^2 60^@ + 4 cos^2 45^@ + 3 sec^2 30^@.

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  17. Evaluate sin 60^(@) cos 30 ^(@) -sin 30^(@) cos 60 ^(@) , What is the ...

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  18. Is it right to say cos(60^@ - 30^@) = cos 60^@. cos 30^@ + sin 60^@. S...

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  19. Is it right to say that cos(A + B) = cos A + cos B. Justify your answe...

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  20. In a right angled triangle ABC, right angled at B, angle ACB = theta, ...

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  21. In a right angled triangle ABC, right angled at C, if tan A = 1, then ...

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