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To solve the trignometric problems u need to know following trignometric identities:
1. tan = sin/cos
2. 1 - sin square = cos square
3. 1 - 
cos square = sin square

you can understand in different ways you can learn them by yourself while learning

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mark as the best answer plzzzzzzzzzz
There are 3 fundamental trig identities 
1) sin²-cos²=1
you can learn these and all other can be framed by these 3 
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