Evaluate the following.
cos 45º
(i) sin 45° + cos 45º
(i)
sec 30° + cosec 60°
2 tan? 45° + cos230° - sin? 60°
(iv)
sin 30° + tan 45º - cosec 60°
cot 45° + cos 60° - sec 30°
sec-60° - tan’60°
sin30° + cos230°
(v)
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Answer:
In the above table (in attachment) values of trignometrical identities for standard are given ....Use them to find the values
How to memorise them ?
- Learn first values of sin theta
- Cos and sin values are interchanged. Ex — sin 30 = cos 60 = 0.5
- Tan values can be found by |
- And cos and sec are reciprocals so are tan and cot and cosec and sin
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