sec70 sin 20+ sec 20 sin 70 =2
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Answered by
1
Step-by-step explanation:
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Answered by
0
Answer:
Step-by-step explanation:
RHS = 2
LHS = sec 70 * cos (90-20) + cosec (90-20) * sin70
= sec 70 * cos 70 + cosec 70 * sin70
= 1/cos70 * cos 70 + 1/sin 70 * sin 70
= 1 + 1
= 2
hence proved
* - means multiplication
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