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- from ..node import ExpressionNode as N, ExpressionLeaf as L, Scope, \
- OP_ADD, OP_POW, OP_MUL, OP_SIN, OP_COS, OP_TAN
- from ..possibilities import Possibility as P, MESSAGES
- from ..translate import _
- def match_add_quadrants(node):
- """
- sin(x) ^ 2 + cos(x) ^ 2 -> 1
- """
- assert node.is_op(OP_ADD)
- p = []
- sin_q, cos_q = node
- if sin_q.is_power(2) and cos_q.is_power(2):
- sin, cos = sin_q[0], cos_q[0]
- if sin.is_op(OP_SIN) and cos.is_op(OP_COS):
- p.append(P(node, add_quadrants, ()))
- return p
- def add_quadrants(root, args):
- """
- sin(x) ^ 2 + cos(x) ^ 2 -> 1
- """
- return L(1)
- MESSAGES[add_quadrants] = _('Add the sinus and cosinus quadrants to 1.')
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