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  1. The value of
    sin 25° cos 65° + cos 25° sin 65°
    tan²70° - cosec²20°
    1. - 1
    2. 0
    3. 1
    4. 2
Correct Option: A

sin25°cos65° + cos25°sin65°
tan² 70° - cosec² 20°

sin25°cos(90° - 25°) + cos25°
sin(90° - sin25°)
tan² 70° - cosec² (90° - 70°)


sin25°sin25° + cos25°.cos25°
tan² 70° - sec² 70°

sin²25° + cos²25°
tan² 70° - sec² 70°

=
1
= - 1
- 1


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